In programming languages normally end users write a function or procedure and call the same function or procedure more than one times.
Explanation:
Normally in programming language use function or procedures with parameter where parameter is classified by two methods, one is by reference other is by value. If a programmer used by reference means he or she send and address holder of variable as parameter to function or procedure.
If parameter received by reference, original value changes inside the function or procedure is possible and can be changed. If same programmer used by value as parameter in function or procedure it is just value holder where content cannot be changed.
Answer a :- true
Answer b:- true
Answer c:-true
Answer d:-true