N cells each of e.m.f. E & internal resistance r are grouped into sets of K cells connected in series. The (N/K) sets ae connected in parallel to a load of resistance R, then,
A. Maximum power is delivered to the load is `K=sqrt((NR)/r)`
B. Maximum power is delivered to the load if `K=sqrt((r)/(NR))`
C. Maximum power delivered to the load is `E^(2)/(4Nr)`
D. Maximum power deliverd to the load is `(NE)^(2)/(4r)`
