Two enzymes responsible for restricting the growth of bacteriophages in $E. coli$ were isolated. One was methylase and the other was restriction endonuclease. What is the significance of methylase?

• A
  Protection of host $DNA$ from the action of restriction endonuclease by adding methyl group to one or two bases usually within the sequence recognized by the restriction enzyme.
• B
  Able to ligate the two cohesive ends of $DNA$ molecule.
• C
  Able to remove the methyl group and hence,prevent the action of restriction endonuclease on host $DNA$.
• D
  Able to cut the $DNA$ of bacteriophage at specific sites.