C programming

Match each code snippet to the value for "x" after execution: 10, 9, 10, 11

1)

int num, x;

num = 10;

x = ++10;

2)

int num, x;

num = 10;

x = num++;

3)

int num, x;

num = 10;

x = --num;

4)

int num, x;

num = 10;

x = num--;