In GCM, we define S as S = GHASH(A||0^v||C||0^u||[len(A)]||[len(C)]). What is v defined as?

128 ceil[len (C)/128] – len (C)

64 ceil[len (A)/128] – len (A)

64 ceil[len (C)/128] – len (C)

128 ceil[len (A)/128] – len (A)

In GCM, we define S as S = GHASH(A||0^v||C||0^u||[len(A)]||[len(C)]).

1.	In GCM, we define S as S = GHASH(A\|\|0^v\|\|C\|\|0^u\|\|[len(A)]\|\|[len(C)]). What is v defined as?
A.	64 ceil[len (A)/128] – len (A)
B.	64 ceil[len (C)/128] – len (C)
C.	128 ceil[len (A)/128] – len (A)
D.	128 ceil[len (C)/128] – len (C)
Answer» D. 128 ceil[len (C)/128] – len (C)