Write а C++ prоgrаm thаt uses a recursive functiоn tо calculate the greatest common divisor (GCD) of two integers. The program should read two numbers from the user and pass them to a recursive function named GCD(int a, int b). The function should return the greatest common divisor of the two numbers using the recursive approach. For example, GCD(12, 8) should return 4 because 4 is the largest number that divides both 12 and 8 evenly.