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What is the maximum directly addressable memory capacity in bytes, if the address bus is 16-bit? Assume each memory location is one byte. Consider a hypothetical 32-bit microprocessor having 32-bit instructions composed of two fields, the first byte contains the opcode and the remainder the immediate operand and or an operand address. a. What is the maximum directly addressable memory capacity in bytes? b. How many bits are needed for the program counter and the instruction register