On interface FastEthernet0/1 carrying voice and data from an IP phone, which command preserves the data packet priority as received from the phone access port?

The switchport priority extend trust command is correct because it configures the switch to trust the Class of Service (CoS) value already set by the IP phone on incoming voice packets. This preserves the priority assigned by the phone, ensuring voice traffic maintains its high priority across the network. Incorrect options: switchport voice vlan dot1p configures the port to use 802.1p for voice VLAN tagging but doesn't explicitly trust the incoming CoS value for prioritization. switchport priority extend cos 7 would re-mark all incoming packets to CoS 7, overriding any existing priority set by the phone. switchport voice vlan untagged configures the voice VLAN to be untagged, which is generally not recommended for voice traffic and doesn't address priority preservation.