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?

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The CRISPR/Cas system is an adaptive immune system that bacteria use to protect themselves from viruses. The spacer regions in the CRISPR/Cas system are short sequences of DNA that are complementary to the DNA of viruses that have infected the bacteria in the past. When a virus infects a bacteria, the CRISPR/Cas system will incorporate a spacer region into its CRISPR array that is complementary to the DNA of the virus. This allows the bacteria to recognize and destroy the virus if it infects the bacteria again. The fact that the bacterial cell in question has six spacer regions suggests that it has been infected by six different viruses in the past and has now developed a level of protection against all of them.

In the CRISPR / Cas System of a Particular Bacterial