Some system architects do not find RISC instruction repertoire to be cost-effective because it

Some system architects do not find RISC instruction repertoire to be cost-effective because it 

(a) result in large increase in programme size (b) result in complex structure of microcode (c) has been observed that an average compiler does not employ more than a limited subset of available instructions (d) results in complex decoding of opcode filed resulting in longer execution time
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Some system architects do not find RISC instruction repertoire to be cost-effective because it 

(a) result in large increase in programme size (b) result in complex structure of microcode (c) has been observed that an average compiler does not employ more than a limited subset of available instructions (d) results in complex decoding of opcode filed resulting in longer execution time

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