Data and Voice VLANs allow for the separation and prioritization of voice and data traffic, which is essential in a network that supports VoIP phones. This ensures that voice traffic is handled with higher priority to avoid latency and jitter, which can affect call quality. A trunk port is not the correct answer because it is used to pass VLAN information between switches, not to differentiate traffic types on a single switch; and port security is a security feature that limits the devices allowed to connect through a specific port and does not prioritize VoIP traffic.