The following table shows the information about a machine executing instructions. There are $5$ classes of instructions, each of which takes $3-5$ steps.

$\backslash$table$[[$Instruction Class,Fetch,$\backslash$table$[[$Register$],[$Read$]],$ALU,$\backslash$table$[[$Memory$],[$access$]],\backslash$table$[[$Register$],[$Write$]]],[$Load Word $($LW$),2ns,1ns,2ns,3ns,1ns$