What is the difference between the following 2 codes?

#include <stdio.h> //Program 2
int main()
{
    int d, a = 1, b = 2;
    d =  a++ +++b;
    printf("%d %d %d", d, a, b);
}

A. Declare a variable B. Declare a function C. Define a function D. Assign a value

A. . B. ; C. : D. ,

A. char B. int C. float D. double

A. int variable_name; B. variable_name = 5; C. variable_name int; D. int = variable_name;