#include <iostream> void modify(const int& num) { num = 10; } int main() { int a = 5; modify(a); std::cout << "a: " << a << std::endl; return 0; } (2 Points) No issue b) Incorrect reference type c) Modifying const variable d) Missing const in function prototype

The issue with the code is option c) Modifying const variable. In C++, when you declare a variable as const, you are telling the compiler that the variable is not going to change during the program execution. In the function modify(), the parameter num is passed as a const reference, which means it cannot be modified. However, the function tries to change the value of num, which is not allowed. Therefore, the code will result in a compilation error.