A device that adds two addend bits and an input carry to obtain a sum bit is called a: comparator full-adder half-adder ripple carry adder Question 2 (1 point) Which internal logic is used to obtain the sum term in a half-adder? OOR XNOR XOR Question 3 point In the most general sense, what is a code? An input to a decoder A sequence of syntax used in a programming language A combination of bits A permutation of bits