How do bacteria that produce restriction enzymes protect their own DNA from the nuclease activity of these restriction enzymes?

A)They add methyl groups to their DNA.
B)They quickly ligate the sites that have been cut by the restriction enzymes.
C)They have extra DNA so the activity of the restriction enzymes does not matter.
D)They have long proteins that bind to their DNA, which protects it from being cut by the restriction enzymes.
E)They produce proteins that degrade their restriction enzymes.