3. a. A program for DE1 SoC is shown below. Answer the following questions. #define switches (volatile char*) 0x00002010 #define leds (char*) 0x00002000 Void main() { While(1) *leds switches; } Questions: a. Explain the output of this program. b. What will happen if the switches are not declared as a volatile? c. Gives three reasons to use the volatile variable. d. Why do we need to set the switches and leds to 2010 and 2000 respectively? What will happen if we set to 3010 and 3000?