Answer:
Channel.
Explanation:
As per the given description, the 'Doctor's Info' would be considered as a channel because it exemplifies the medium of physical transmission of his message to different locations so that it reaches to a wide range of audience that would help him to aware the people about his clinic and increase the number of patients visiting his clinic. This full-page advertisement in the weekly publication would be characterized as a channel also because it is functioning to establish the network, connectivity, and communication among the people and the doctor. Therefore, 'channel' is the correct answer.
