Per AC 107-2A § 8.3.1, which factor should a remote pilot consider when choosing a minimum stand-off distance from people who are not directly participating in the operation?

Why: AC 107-2A § 8.3.1, p. 8-2, lists the aircraft's performance (course, speed, trajectory, maneuverability), environmental conditions, operational-area conditions, probable failures, and the remote pilot's familiarity with the aircraft as factors in choosing a stand-off distance.

• This invents a numeric minimum distance; § 107.51 contains no stand-off distance figure, and AC § 8.3.1 opens by stating that part 107 imposes no specific stand-off distance requirement.
• A liability waiver has no bearing on the regulatory analysis; AC § 8.3.1's listed factors concern operational and physical risk, not paperwork between the pilot and the overflown person.