The answer is 'A'.
For some people, this might be confusing since the port has to be enabled as trunk port to carry different types of data/two vlans.
but Voice VLAN config is an exception, although we might need to config it as trunk, we are doing it as an access port only. the access port itself acts as trunk port
This is an exception.
For some this may be confusing and it go be the first time around untill i looked at the answer more clearly. The answer is A, because lets say you wanted to configure the port as a management port, you would want to configure that interface first before the voice vlan. Thats the only I remember from working with switching as an administrator
VoIP phones work in a weird way. The access port is split into two ports, one for voice and one for data. So somehow the access access port behaves like a trunk.
Some very good discussions covering answer D which illustrate this command line being invalid:
https://community.cisco.com/t5/switching/what-happens-when-voice-vlan-command-is-added-to-a-trunk-port/td-p/1570579
https://learningnetwork.cisco.com/s/question/0D53i00000Kt1GR/voice-vlan-on-a-trunk-port
While A seems to be incorrect syntax and an invalid command line, of the choices listed A is the best answer.
https://www.learncisco.net/courses/icomm-ccna-voice/cisco-uc-solution-maintenance/switch-configuration.html#:~:text=Cisco%20allows%20us%20to%20have%20two%20VLANs%20connected%20to%20one%20port%2C%20it%27s%20a%20multi-VLAN%20access%20port.%20And%20Cisco%20allows%20us%20to%20bend%20the%20rules%20if%20and%20only%20if%20one%20of%20those%20two%20VLANs%20is%20a%20voice%20VLAN
https://community.cisco.com/t5/switching/subinterface-to-access-port/td-p/3804800
https://www.reddit.com/r/networking/comments/m5ruhr/8021x_and_allowing_phones_on_voice_vlan/
https://www.cisco.com/c/en/us/support/docs/switches/catalyst-2950-series-switches/113260-voice-vlan-00.html#:~:text=Configure%20specified%20VLANs%20for%20voice%20and%20data%20traffic
https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2960/software/release/12-2_40_se/configuration/guide/scg/swvoip.pdf
There are a couple of extra step you have to do to make answer D work and it's not given in the choices so I stayed away from it.
i.e. on G1/1
sw tr en dot
sw mod tr
sw tr al nat vl { 0-4094}
sw voice vl 400
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