In the solution of load-flow equation, Newton-Raphson (NR) method is superior to the Gauss-seidel (GS) method, because

A)     Time taken to perform one iteration in the NR method is less than when compared to time taken in GS method

B)      Number of iterations required in the NR method is more when compared to that in the GS method

C)      Number of iterations required is not independent of the size of the system in NR method

D)     Convergence characteristics of the NR method are not affected by the selection of slack bus