Let rk be the residual in the kth level of multi-grid approach. Which of these give the restriction operator?

Let rk be the residual in the kth level of multi-grid approach. Which

1.	Let rk be the residual in the kth level of multi-grid approach. Which of these give the restriction operator?
A.	\(\frac{r^{k+1}}{r^k} \)
B.	\(\frac{r^k}{r^{k+1}}\)
C.	rk+1-rk
D.	rk-rk+1
Answer» B. \(\frac{r^k}{r^{k+1}}\)