Which of the following does Temporal Key Integrity Protocol (TKIP) support?

TKIP supports multicast and broadcast messages by using a group temporal key (GTK) distributed to all devices in the BSS, allowing encrypted group communications. This was a deliberate design requirement to address WEP's weaknesses while maintaining compatibility with existing hardware, enabling both unicast (via pairwise keys) and multicast/broadcast (via group keys) traffic protection.

Coordination of IEEE 802.11 protocols is handled by the MAC layer and management functions such as the Distributed Coordination Function (DCF), not by TKIP, which is strictly an encryption/integrity protocol.

TKIP was designed to replace and improve upon WEP's security flaws, not to support WEP systems; it uses per-packet key mixing and message integrity checks (MIC) specifically to overcome WEP's vulnerabilities.

Synchronization of multiple devices is a function related to timing mechanisms such as the Timing Synchronization Function (TSF) in 802.11, which is entirely unrelated to TKIP's role as a data encryption and integrity protocol.