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28. The memory unit of a computer has 256K words of 32 bits each. The computer has an instruction format with four fields: an opcode field; a mode field to specify one of seven addressing modes; a register address field to specify one of 60 registers; and a memory address field. Assume an instruction is 32 bits long. Answer the following: a) How large must the mode field be? b) How large must the register field be? c) How large must the address field be? d) How large is the opcode field