The memory unit of a computer has 512K words of has an instruction format with 4 fields: opcode, add and memory address. Given that there are 4 addressing mode, 32-bit instruction, answer the following questions: 32 bits each. The computer ress mode, register address 50 register and 1. How large is the opcode? 2. How large is the address mode field? 3. How large is the register field? 4. How large is the memory address field