Which of the following statements best describes the difference between call by value and call by reference in C++?Call by value involves passing a copy of the argument to the function, while call by reference involves passing the actual argument itself.Call by value and call by reference are identical in C++, both involving passing the actual argument itself.Call by value involves passing the actual value of the argument to the function, while call by reference involves passing the address of the argument.Call by value is used for primitive data types, while call by reference is used for complex data types.

The statement that best describes the difference between call by value and call by reference in C++ is: "Call by value involves passing a copy of the argument to the function, while call by reference involves passing the actual argument itself."

Here's why:

1. Call by Value: In this method, the value of each of the actual arguments in the calling function is copied into corresponding formal arguments of the called function. The changes made to the formal arguments in the called function have no effect on the values of actual arguments in the calling function.

2. Call by Reference: In this method, the address of the actual arguments (or the variables) in the calling function is copied into the formal arguments of the called function. This means that using these addresses, we could access the actual arguments and also modify them. The changes made to the formal arguments in the called function affect the values of actual arguments in the calling function.