A 2's-complement adder-subtracter can add or subtract binary numbers. Sign-magnitude numbers represent _____ decimal numbers, and 2's complements stand for _____ decimal numbers.

A 2's-complement adder-subtracter can add or subtract binary numbers.

1.	A 2's-complement adder-subtracter can add or subtract binary numbers. Sign-magnitude numbers represent _____ decimal numbers, and 2's complements stand for _____ decimal numbers.
A.	hexa, sign
B.	sign, hexa
C.	positive, negative
D.	negative, positive
Answer» D. negative, positive