What are the two variants of NTPv4? (Choose two.)

The client/server mode is a fundamental NTP variant where clients explicitly send time requests to NTP servers, and servers respond with time synchronization messages, providing accurate time synchronization.

The broadcast mode is another NTP variant where an NTP server periodically broadcasts time synchronization messages to all clients on a local network segment, enabling simpler configuration for a group of clients.

Multicast mode is indeed an NTP variant but is less common than client/server or broadcast modes; if only two are requested, A and B are typically considered the primary foundational variants.

Asymmetric is not a standard, recognized operating mode for NTPv4; NTP modes define how time exchange occurs (e.g., client/server, broadcast, symmetric).

Unicast describes the addressing method used in client/server and symmetric modes, where packets are sent to a specific address, rather than being a distinct NTP operating variant itself.