When configuring a physical interface on a Palo Alto Networks firewall, which IP-based service is...

Basic Concept: DDNS client functionality requires an IP-addressed routed interface. Layer 2 interfaces do not own the routed IP context needed for DDNS updates.

Why A is Correct: DDNS client is available on Layer 3 interfaces because it publishes the interface's IP mapping to DNS.

Why B is Wrong: NetFlow export is a valid Palo Alto Networks or networking concept in another context, but it does not implement the exact configuration outcome required by this question.

Why C is Wrong: QoS is a valid Palo Alto Networks or networking concept in another context, but it does not implement the exact configuration outcome required by this question.

Why D is Wrong: Link monitoring is a valid Palo Alto Networks or networking concept in another context, but it does not implement the exact configuration outcome required by this question.