During the 1930s, the Civil Service Commission operated under a "rule of three," according to which Group of answer choices federal employers were required to interview at least three minority applicants for each open position. federal employers could select a second- or third-ranked white candidate over a first-ranked black candidate. federal employers were required to hire one minority applicant for every three white workers already in service. federal employers could fire minority workers without cause, as long as they retained at least three minorities in their departments