Channel as medium example – UGC NET Question

The channel is the medium through which an encoded message travels from sender to receiver. A messaging app carries text,images or audio from the teacher to students. Thus it functions as the channel in this communication situation.

Option A:
The sender is the teacher who creates and sends the notes,not the app itself.

Option B:
The receiver is the student who reads the notes and interprets them. The stem asks about the medium,not the person.

Option C:
The notes themselves are the message that contains content,not the pathway along which they travel.

Option D:
Channel correctly labels the technological path enabling transmission,making it the right completion here.