Represent the following signed numbers in binary using 8 bits. +83; -83; +68; -68.

A. Perform the addition (-83) + (+68) in binary and interpret the result obtained.

B. Perform the subtraction (-68) - (+83) in binary and indicate if there is overflow.

C. Shift binary -83 once to the right and give the value of the shifted number in decimal.

D. Shift binary -83 once to the left and indicate if there is overflow.