$.$

You are an analyst tasked with writing a request for proposals for an executive search firm to conduct a recruitment. What element is most important to include in the request for proposal?

a$.$The cost and timeline for completion of the search.

b$.$Conducting a detailed background check of all the qualified competitors.

c$.-$Establishing a small number of key metrics and not imposing your agency$$s processes on the recruiter.

d$.-$Identification of preferred recruitment sources for the search firm to use.