To answer this question, we need to understand the return type of the method check4Biz().

Based on the given code snippet if(check4Biz(storeNum) != null) {}, we can infer that the method check4Biz() is returning a reference type that can be compared to null.

Let's go through each option to determine the correct return type:

Option A) boolean - This option is incorrect because a boolean value cannot be compared to null. It can only have the values true or false.

Option B) int - This option is incorrect because an int value also cannot be compared to null. It can only hold numeric values.

Option C) String - This option is correct because a String is a reference type that can be compared to null. It can hold text values and can be compared to null to check if it is empty or uninitialized.

Option D) char - This option is incorrect because a char value cannot be compared to null. It can only hold single character values.

Therefore, the correct answer is C) String. The method check4Biz() is expected to return a String datatype.

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• Wrong explanation

To answer this question, let's go through each option to understand why it is correct or incorrect:

Option A) All the wrapper classes (Integer, Boolean, Float, Short, Long, Double, and Character) are public. This option is correct because all the wrapper classes in Java are indeed public.

Option B) All the wrapper classes (Integer, Boolean, Float, Short, Long, Double, and Character) are serializable. This option is incorrect because not all the wrapper classes are serializable. Only a few wrapper classes, such as Integer, Float, Double, and Character, are serializable.

Option C) All the wrapper classes (Integer, Boolean, Float, Short, Long, Double, and Character) are immutable. This option is correct because all the wrapper classes in Java are immutable. This means that once an object of a wrapper class is created, its value cannot be changed.

Option D) All the wrapper classes (Integer, Boolean, Float, Short, Long, Double, and Character) extend java.lang.Number. This option is incorrect because not all the wrapper classes extend from the java.lang.Number class. Only a few wrapper classes, such as Integer, Float, Short, Long, Double, extend java.lang.Number.

The correct answer is C) All the wrapper classes (Integer, Boolean, Float, Short, Long, Double, and Character) are immutable. This option is correct because all the wrapper classes in Java are indeed immutable.

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• Wrong explanation

To answer this question, you need to understand the different options available with the PROC FORMAT statement in SAS.

Option A) FMTSEARCH - This option is incorrect because it is used to specify one or more format catalogs to search for formats. It is not used to document the formats in a particular format catalog.

Option B) FMTERR - This option is incorrect because it is used to specify whether error messages are generated when a format is not found or when a format is found but it cannot be applied.

Option C) CATALOG - This option is incorrect because it is used to specify the name of the format catalog to create or modify, but it is not used to document the formats in a particular format catalog.

Option D) FMTLIB - This option is correct because it is used with PROC FORMAT to document the formats in a particular format catalog. It specifies the name of the format catalog to be documented.

The correct answer is D) FMTLIB. This option is correct because it is used to document the formats in a particular format catalog.

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• Wrong explanation

To answer this question, we need to understand that JDBC (Java Database Connectivity) is a Java API that provides a standard way to interact with relational databases. The JDBC classes are part of the Java standard library and are contained in the java.sql package.

Let's go through each option to understand why it is correct or incorrect:

Option A) java.jdbc and javax.jdbc - This option is incorrect because there is no package named java.jdbc or javax.jdbc. The correct package is java.sql.

Option B) java.jdbc and java.jdbc.sql - This option is incorrect because there is no package named java.jdbc.sql. The correct package is java.sql.

Option C) java.sql and javax.sql - This option is correct because the JDBC classes are contained in the java.sql package. The javax.sql package also contains additional JDBC-related classes and interfaces.

Option D) java.rdb and javax.rdb - This option is incorrect because there is no package named java.rdb or javax.rdb. The correct package is java.sql.

The correct answer is C. The JDBC classes are contained in the java.sql package, and the javax.sql package contains additional JDBC-related classes and interfaces.

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• Wrong explanation