The enzyme used by the bacteria to cut the DNA of the invading virus for its protection is:

Explanation

Restriction enzyme, also called restriction endonuclease, a protein produced by bacteria that cleaves DNA at specific sites along the molecule. In the bacterial cell, restriction enzymes cleave foreign DNA, thus eliminating infecting organisms.Specific endonucleases, also called restriction endonucleases, are available that cleave specific sites within a DNA sequence. Exonuclease is usually non-specific and does not have defensive properties against the entry of pathogenic microbes.Ligase is an enzyme that uses ATP to form bonds, and is used in recombinant DNA cloning to join restriction endonuclease fragments that have annealed. (There is no such thing as restriction ligase)A DNA polymerase is a member of a family of enzymes that catalyze the synthesis of DNA molecules from nucleoside triphosphates, the molecular precursors of DNA.