1. Requests for Admissions are always statements. They are never questions. (Admit or Deny that you did this or that.)
2. No. They are sent to the opposing party, not witnesses.
3. Yes.
4. If the responding party feels the request is irrelevant, burdensome, or asks for privileged information, that party may object to the question and refuse to respond.
5. The requesting party may assume the request is admitted.