Problem $3(20$ points$)$: Table below shows the propagation time in $ps,$ for different elements in the single cycle data path $($Assume the complete data path$).$

$\backslash$table$[[$IM$,$ADD,MUX,ALU,REGS,D$-$MEM,$\backslash$table$[[$SIGN$-],[$EXT$]],\backslash$table$[[$SHIFT$-],[$LEFT$2]]],[100,70,20,90,90,250,15,10$