Which of the following statements is true about the database synchronization process on an IS-IS broadcast network?
A . As the DIS, R2 sends a CSNP packet periodically.
B . The interval at which R2, as the DIS, sends Hello packets is three times that of other routers.
C . As the DIS, R2 does not receive the PSNP requests from other routers.
D . R1 and R3 maintain the database consistency by sending PSNP packets periodically.
Answer: A