Consider the design of two logic circuits that both have four inputs: A, B, C and D; and one output: X. Each circuit is implemented using 4-input AND gates (with negated inputs) and each circuit has an OR gate to generate its output.
• For circuit 1, X is defined to be 1 if and only if interpreting ABCD as an unsigned binary integer results in an odd number. Note A is the most significant bit, then B, and so on.
• For circuit 2, X is defined to be 1 if and only if the total number of 1's among A, B, C and D is odd.
Which of the following 4-input gates would be used in the implementation of both circuits?
FYI: Be certain; Canvas deducts points for incorrect choices.