Consider the results of Problem 10.6. Assume that M is a 16-bit memory address and that X, Y, and Z are either 16-bit addresses or 4-bit register numbers. The one-address machine uses an accumulator, and the two- and three-address machines have 16 registers and instructions operating on all combinations of memory locations and registers. Assuming 8-bit opcodes and instruction lengths that are multiples of 4 bits, how many bits does each machine need to compute X?