By eight-bit signed two's-complement arithmetic, the answer of -75_(10)+59_(10) is: [2 points]
(A) 11001100
(B) 11111001
(C) 11000011
(D) 11110000
(E) 11110101
3. By eight-bit signed two's-complement arithmetic, the answer of --751o + 591o is: [2 points
(A) 11001100
(B) 11111001
(C) 11000011
D 11110000
(E) 11110101