5. (a) If the computer has 32 data registers (R0 to R31), 2000 words in memory, and 16 different instructions. What is the minimum size of an add instruction in bits if a typical instruction use the following format: add RO R2 (b) A microprocessor has the following instruction. ADD Rd, RsI, Rs2. Where Rd is the output destination register and Rsl, Rs2 are two input source registers. Is the Microprocessor a RISC or a CISC? Please give your reasons. (10%)