Answer:
Output channel
Explanation:
There are two types of channels in the audio interface:
1. input channel
2. Output channel
The input channel is for inputting the sound, and hence we plug into it the microphone so that our voice can be recorded by the computer via the input channel of the audio interface. The second one is the output channel, and we connect to it the headphone so that we can listen to the sound coming out via the output channel of the audio interface. And hence, the correct answer here is as above.
