Consider achieving the best performance for the following instructions:

$\backslash$table$[[1,$LW R$1,(100)],[2,$LW R$2,(200$R$1)],[3,$LW R$3,(300)],[4,$ADD R$3,$R$1,$R$2],[5,$ADD R$5,$R$2,$R$3],[6,$SUB R$7,$R$3,$R$6]]$

The data hazards between $2$ and $4$ can be solved by

Select one:

a$.$ forwarding and stall

b$.$ stall and forwarding

c$.$ replicating hardware

d$.$ Stall

e$.$ Forwarding