Consider achieving the best performance for the following instructions:

$1$

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 $1$ and $2$ can be solved by:

Select one:

a$.$ Stall

b$.$ forwarding

c$.$ stall and forwarding

d$.$ forwarding and stall

e$.$ Replicating hardware