IV) Assume that we would like to expand the RISC-V register file to 128 registers and expand the instruction set to contain four times as many instructions. Note that having "four times as many instructions" means the current opcode field that specifies 128 instructions now must be expanded to specify 512 instructions. Explain how you made each particular decision! a) How would this affect the size of each field in the R-type instructions ? b) How would this affect the size of each field in the I-type instructions ? c) How could each of the proposed changes in parts (a) and (b), decrease the size of a RISC-V machine language program? On the other hand, how could the proposed change increase the size of a RISC-V machine language program? IV) Assume that we would like to expand the RISC-V register file to 128 registers and expand the instruction set to contain four times as many instructions. Note that having "four times as many instructions" means the current opcode field that specifies 128 instructions now must be expanded to specify 512 instructions. Explain how you made each particular decision! a) How would this affect the size of each field in the R-type instructions ? b) How would this affect the size of each field in the I-type instructions ? c) How could each of the proposed changes in parts (a) and (b), decrease the size of a RISC-V machine language program? On the other hand, how could the proposed change increase the size of a RISC-V machine language program