The correct answer is C. agePtr.
A pointer is a variable that stores the address of another variable. In this case, the pointer agePtr stores the address of the variable age. The asterisk (*) in front of agePtr indicates that it is a pointer.
Option A is incorrect because *agePtr is the value stored in the pointer agePtr. It is not the name of the pointer.
Option B is incorrect because age*Ptr is not a valid syntax.
Option D is incorrect because NULL is a constant that represents the null pointer. It is not the name of the pointer.