In the diagram below, which device outputs a "0" if both of its input values are identical? i.e. If both inputs are "1" the output is a "0", if both inputs are "0" the output is still a "0".

a. Component 4

b. Component 2

c. Component 1

d. Component 3

Component 4 Component 2 Component 3 NOTE: The shaded component is called a multiplexer. C is the control line for the multiplexer. When C = 0, A is selected, so X = A. When C = 1, B is selected, so X = B. Component 1