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.