With All of the Options Available for Sourcing Potential Applicants

With all of the options available for sourcing potential applicants, how does a recruiter choose which method(s) to use?

A) they choose the most cost-effective method
B) they look for similar styles used elsewhere in the past that could be useful to this recruitment need
C) they use questions such as how many recruits are needed and what has worked in the past as a guide to the best methods
D) they will follow what sources are the trendiest at that time
E) they are given direction by their director or manager