The Modified Nitrogenous Base Found in the T4 Phage DNA

The modified nitrogenous base found in the T4 phage DNA also contains an attached glucose derived residue that is used for what purpose?

A) To increase transcription from phage promoters
B) To protect phage from phage encoded nucleases
C) To protect phage from host encoded restriction enzymes.
D) To indicate a site for head-full packaging
E) All f these