A gate agent is calling passengers to board a flight on ECON455 airlines. The aircraft serving passengers on today's flight has 30 rows, numbered 1−30, with four seats in each row, Seat A is the pilot side window seat in each row. Seat B is the pilot side aisle seat in each row. Seat C is the co-captain side aisle seat in each row. Seat D is the co-captain side window seat in each row. The gate agent begins by inviting passengers with pilot-side window seats two rows apart to board, starting first with the passenger in seat 30 A, then 28 A, then 26 and so on. Next, the gate agent invites passengers with co-pilot-side window seats two rows apart to board, starting first with the passenger in seat 30D, then 28D then 26D and so on. The process continues with odd row window seats on each side. The process then repeats for aisle seats, starting first with the passenger in se 30 B, then 28 B, then 26 B and so on..... The boarding process for this airplane is an example of a. a heuristic b. an experimental treatment c. an algorithm d. a logarithm