An 8-bit CPU adds the following two numbers. Determine the 8-bit sum in hexadecimal and the values of the zero, sign, carry, and overflow flags.
a) Sum: 85, Flags: Z=0, S=0, C=0, V=0
b) Sum: 90, Flags: Z=0, S=0, C=0, V=0
c) Sum: A0, Flags: Z=0, S=0, C=0, V=0
d) Sum: A5, Flags: Z=0, S=0, C=0, V=0