Problem 4. (20 points, TimerA, Watchdog Timer) Consider the following code segment that utilizes the watchdog timer in in the interval mode with period set to 1 s (line 4 of the code). 1 . #include 2. void main(void) 3. int p = 0; NDTCTL-WDT ADLY 1000: 1 interval tiner P2DIR -BIT2: II Set P2.2 to output direction tor (:2 Pt+ 10 IFG1WDTIFG: 12 13. A. (5 points) What does the code segment do? B. (5 points) How would you implement the given functionality using an interrupt service routine