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.