You have configured an AOS-CX switch to implement 802.

Voice Role VLAN Configuration:

When VoIP phones are authenticated and assigned to the " voice " role, VLAN 12 should be explicitly defined as an allowed trunk VLAN within the role configuration.

The VLAN configuration should be role-specific rather than on the edge port, as this ensures dynamic VLAN assignment based on authentication results.

Option Analysis:

Option A: Incorrect. Native VLANs are for untagged traffic, but VoIP traffic is tagged.

Option B: Correct. VLAN 12 must be configured as the allowed trunk VLAN in the " voice " role to tag VoIP traffic correctly.

Option C: Incorrect. Configuring VLAN 12 in both edge port and role settings is redundant and unnecessary.

Option D: Incorrect. Native VLANs do not handle tagged traffic like VLAN 12 for VoIP phones.