Let $f(x+y)=f(x)f(y)$ $\forall x,y\in R$. Suppose that $f(3)=3$ and $f'(0)=11$, then $f'(3)$ is given by

Question

$(a)\;22\qquad(b)\;44\qquad(c)\;28\qquad(d)\;33$