How many bits are expressed by”;:” in the address 2D01:DB::C:B7BA:130B?

How many bits are expressed by”;:” in the address
2D01:DB::C:B7BA:130B?
A. 16 bits
B. 32 bits
C. 48 bits
D. 40 bits
E. 44 bits
F. 52 bits
G. 56 bits
H. 64 bits