A carrier is a human being that

Options :
  1. functions as a reservoir of infection
  2. possesses pathogen but is not harmed
  3. contains antibodies sufficient enough to balance the antigen
  4. all the above
Answer and Explanation :-

Answer: Option 4

Explanation:

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I wonder if it's like this for mountain climbers, he thought. You climb bigger and bigger mountains and you know that one day one of them is going to be just that bit too steep. But you go on doing it, because it's so-o good when you breathe the air up there. And you know you'll die falling.
-Terry Pratchett Going Postal