Q$4.$ Draw the abstract figure of a microprocessor which executes only add, ld $,$ sd instructions in RISC$-$V ISA. The microprocessor should implement following steps.

$-$ Take the next instruction from instruction memory by using the address of the instruction

$-$ Calculate the address of the next instruction $($Note that there is no branch operation$)$

$-$ Take the source operands from the register file or from the instruction

$-$ Make the calculation in ALU

$-$ Access memory for loading$/$storing data with the correct information

$-$ Update register file with the result