Consider the following truth table. Also consider the following 1-bit ALU that performs AND, OR, and addition on a and b. Assume that the Ainvert and Binvert signals can be asserted or deasserted and that the CarryIn signal can be deasserted or taken from the CarryOut of the preceding 1-bit ALU. The value of a NOR b can be obtained by asserting Ainvert and Binvert and selecting an AND operation. (a) Describe how the value of a NAND b can be obtained. (b) Describe how the value of a XOR b can be obtained