Onera Technologies has been hiring for data scientists from two different sources. When Onera tried to find job candidates through campus recruiting, targeting upcoming computer science graduates at the local university, there were 50 applicants. Of the 50 applicants, 30 proceeded to a phone interview, then 10 made it to a virtual live video interview, and finally, at the end, 5 applicants were hired. The total cost of campus hiring, including resources dedicated to this endeavour and the cost to post, totalled $20,000. When Onera tried to find job candidates through an online job board, there were 100 applicants. Of the 100 applicants, 20 proceeded to a phone interview, then 15 made it to a virtual live video interview, and finally, at the end, 5 applicants were hired. The total cost of hiring through the online job board, including resources dedicated to this endeavour and the cost to post, totalled $15,000. Which can be suggested about the effectiveness of these two channels? a. Campus recruiting provided a higher yield ratio, but had a higher cost per hire. b. Campus recruiting provided a lower yield ratio and had a higher cost per hire. c. Campus recruiting provided a lower yield ratio and had a lower cost per hire. d. Campus recruiting provided a higher yield ratio and had a lower cost per hire