Where marked by a letter (a, b, c, d), indicate the hexadecimal value of the destination operand:

mov ax,word1

inc ax a. AX = 0000h

dec ax b. AX = FFFFh

mov ax,word3

neg ax c. AX = 8001h

add ax,0C2A5h d. AX = 42A6h

How do I go about solving this? I know the answers are there but don't know how to solve the problem.