*Need help question #6 (a to d)

6. Given a 4-bit Adder - Flags: C = Carry Flag, N == Sign Flag, Z = Zero Flag, V = Overflow Flag

a. Briefly describe what logic gate is required to clear/set the Zero flag on a 4-bit adder.

b. Briefly describe the logic gate needed to clear/set the overflow flag on a 4-bit adder (which bits are input to the gate).

c. Briefly describe the logic gate needed to clear/set the carry flag on a 4-bit adder. Hint: it is not just the carry out of bit #3.

d. Which SUM bit should connect to the sign flag on the 4-bit adder?