Fill in the following blanks:
There is a total of ___A___ different possible codons, among them ____B___ specify amino acids and _C__ codons do not specify any amino acid.

• A

  A-64; B-20; C-3

• B

  A-64; B-61; C-3

• C

  A-20; B-15; C-5

• D

  A-20; B-17; C-3