The CRISPR-Cas system helps some prokaryotes defend against infection by viruses. Which of the following statements correctly describes how this system works?
1) The CRISPR-Cas system uses RNA molecules to target and destroy viral DNA.
2) The CRISPR-Cas system uses enzymes to repair viral DNA and prevent infection.
3) The CRISPR-Cas system uses proteins to block viral entry into prokaryotic cells.
4) The CRISPR-Cas system uses antibodies to neutralize viral particles.