How Does a Bacterial Cell Protect Its Own DNA from Restriction

How does a bacterial cell protect its own DNA from restriction enzymes?

A) adding methyl groups to adenines and cytosines
B) using DNA ligase to seal the bacterial DNA into a closed circle
C) adding histones to protect the double-stranded DNA
D) forming "sticky ends" of bacterial DNA to prevent the enzyme from attaching
E) reinforcing the bacterial DNA structure with covalent phosphodiester bonds

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