What is a medium

Question

1. Someone who communicates
2. Something not too hard or too easy
3. A clothing size
4. a way to present

Answer 1

I want to say A

Answer 2

n the communication process, a medium is a channel or system of communication—the means by which information (the message) is transmitted between a speaker or writer (the sender) and an audience (the receiver). The plural form is media, and the term is also known as a channel.