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Suppose a 64-bit instruction takes the following format:

OPCODE DR SR1 SR2 UNUSED

If there are 8 opcodes and 10 registers,

a. What is the minimum number of bits required to represent the OPCODE?
b. What is the minimum number of bits required to represent the Destination Register (DR)?
c. What is maximum number of UNUSED bits in the instruction encoding?

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Suppose a 64-bit instruction takes the following format:

OPCODE DR SR1 SR2 UNUSED
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