For the purposes of subparagraph 91.875(2)(i)(i), the number of persons allowed on board the aircraft is:
(a) if the holder of the experimental certificate for the aircraft holds an approval under regulation 91.045--the number specified in the approval; or
(b) if paragraph (a) does not apply and the aircraft is a Part 103 aircraft--2; or
(c) in any other case--the lesser of the following:
(i) the number of persons the aircraft was designed to carry;
(ii) 6.