To answer this question, the user needs to know the difference between procedure pointers and function pointers and their respective use cases.

A function pointer is a pointer that points to a function. It can be used to call the function that it points to. A procedure pointer, on the other hand, is a pointer that points to a procedure. A procedure is similar to a function but does not return a value.

Now, let's go through each option and see which one is correct:

A. (1) C/C++-to-COBOL programs calls: This option is incorrect. Procedure pointers are not typically used in C/C++-to-COBOL programs calls. Instead, function pointers are used for this type of program.

B. (2) COBOL-to-C/C++ programs calls: This option is incorrect. Procedure pointers are not typically used in COBOL-to-C/C++ program calls. Instead, function pointers are used for this type of program.

C. (3) COBOL-to-COBOL programs calls: This option is correct. Procedure pointers are more efficient than function pointers for COBOL-to-COBOL program calls. This is because COBOL does not support function pointers, so procedure pointers must be used instead.

D. (4) C/C++-to-C/C++ programs calls: This option is incorrect. Function pointers are typically used for C/C++-to-C/C++ program calls, not procedure pointers.

Therefore, the correct answer is:

The Answer is: C. (3) COBOL-to-COBOL programs calls