What are the roles of Cas1, Cas2, and Cas9 proteins in bacterial genome defense?
a) Cas1: Spacer acquisition, Cas2: Adaptation, Cas9: Interference
b) Cas1: Interference, Cas2: Spacer acquisition, Cas9: Adaptation
c) Cas1: Interference, Cas2: Degradation, Cas9: Repair
d) Cas1: Repair, Cas2: Adaptation, Cas9: Spacer acquisition