Which two statements about NTP are true? (Choose two.)

NTP (Network Time Protocol) primarily uses UDP port 123 for communication, not TCP. UDP is preferred for its lower overhead, which is suitable for time synchronization where occasional packet loss is tolerable and retransmission mechanisms are not strictly necessary. Cisco routers are versatile and can function in various NTP roles. They can be configured as NTP clients to synchronize their clocks with an external NTP server, or they can act as NTP servers themselves, providing time services to other devices on the network. They can also be authoritative servers if they are synchronized to a reliable time source like a GPS receiver. Therefore, options stating routers can only be servers or only clients are incorrect.