The supervisor lor the I imance Department fees like the recruitment process is too costly compared to the Maintenance Department? recruitment costs. Which metric is the most effective method to use in this scenario? a. Applicants per opening: Iotal number of applicants / number of job openings 1. cost per hire: (lotal internal cost + total extemal cost) / total number of hires c. Yield ratio: Number of applicants who successfully completed the stage / total number of applicants who entered the stage d. lime to fill: Number of days between publishing a job opening and hiring the candidate