choose answer and with process please

What's the value of register a and b after the following GBz80 code snizpet be executed "xor a choose the correct one: ld b,a a. a==$01b==$02 ld c,a b. a==$03b==$02 ld hl, \$0101 c. a==$02b==$02 inc c d. a==$02b==$04 add hl, bc e, a==$03b==$04 inc bc f. a== b=404 add hl,bc