Question: What IP versions must GTPv2 entities support?
Option 1: IPv4 and IPv6
Option 2: Only IPv4
Option 3: Only IPv6
Option 4: Either IPv4 or IPv6, but not both
Explanation: According to the specifications, GTPv2 entities are required to support both versions of the Internet Protocol, which includes version 4 (IPv4) and version 6 (IPv6), ensuring compatibility with different network architectures.