Task$4$: Describe the difference between the following hardware designs of a

processor:

$($a$)$ Single$-$cycle processor

$($b$)$ Pipelined processor $($with no forwarding or hazard detection$).$

$($c$)$ Pipelined processor with hazard detection $($and stalling$)$ but no

forwarding.

$($d$)$ Pipelined processor with a forwarding unit.

Provide diagrams of the datapath for each alternative.

Which of the above designs require adding NOP instructions by the program

compiler to eliminate potential data hazards?