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12. A computer has a memory unit with 32 bits per word and has 28 general-purpose registers. The instruction set consists of 130 different two-operand instructions. Some instructions have two register operands and other instructions have two memory address operands. Each instruction is stored in one word of memory. a. How many bits are needed to specify an opcode? b. How many bits are needed to specify a register? c. What is the maximum number of bits that could be used to specify a memory address? (32- 8)/2 12 d. Given your answer to part (c), what is the maximum allowable size for memory in KB, assuming that the memory is word-addressable? Express your answer as simply as possible. Show any necessary work below the answer line. 212 4-214-16 KB