1. Which is valid C expression? a) int my_num = 100,000; b) int my_num = 100000; c) int my num = 1000; d) int $my_num = 10000; AnswerAnswer: b [Reason:] Space, comma and $ cannot be used in a variable name. 2. What is the output of this C code? #include <stdio.h> int main() {…