In the CRISPR / Cas System of a Particular Bacterial

Multiple Choice

In the CRISPR / Cas system of a particular bacterial cell,it is noted that there are six spacer regions.What does this suggest about the bacterial cell?

A) The cell has been infected by six viruses in the past.
B) The cell has developed protection from six different viruses.
C) The cell has six CAS genes due to past infections by viruses.
D) The cell has been infected by six viruses in the past and now has developed a level of protection against all of them.