Which of the following is true about IPv6?

TCP port numbers are a layer 4 concept and are independent of the underlying IP version (IPv4 or IPv6), so they have not changed.

IPv6 replaces the traditional IPv4 broadcast addressing scheme with a more efficient multicast mechanism. Instead of sending packets to all hosts on a segment, IPv6 uses various multicast groups, such as the all-nodes multicast address (ff02::1), to target specific sets of devices or all devices if needed, thereby reducing network overhead.

IPv4 addresses cannot be used directly with IPv6; they need to be embedded or translated using mechanisms like NAT64 or dual-stack.

IPv6 heavily relies on multicast addresses, which are fundamental for its operation, including neighbor discovery and service discovery.

UDP and TCP are transport layer protocols that are fully supported by IPv6; RTP is an application layer protocol often used over UDP, not a replacement for UDP/TCP.