A feedback is when someone replys to your message
Answer: Most likely 2, Close.
Explanation: If it's not, I'd pick 3: Loud as my second answer. The paragraph hints distance so I can only imagine it being 2.
They are sources that you can find the date, author, and have real facts and not just made up. Like if you went to the IRS website then that is a credible source for tax where as going to Wiki they are not credible because anybody can go there