In the Instruction Fetch Unit below, the capacity of the shift register is 6 bytes. Explain the pros and cons of using a smaller (e.g. 5-byte) or a larger (e.g. 12-byte) shift register on the efficiency of this IFU. 2. Shift register From memory c MBR1 2 low-order bits C bus B bus PC +1,2 Write PC In the Instruction Fetch Unit below, the capacity of the shift register is 6 bytes. Explain the pros and cons of using a smaller (e.g. 5-byte) or a larger (e.g. 12-byte) shift register on the efficiency of this IFU. 2. Shift register From memory c MBR1 2 low-order bits C bus B bus PC +1,2 Write PC