direct applications can be a cost - effective source of good job applicants, especially for which type of…

Brief Explanations:

Direct applications are often more common and cost - effective for blue - collar jobs as these jobs may attract a large number of local or less formally recruited candidates who are likely to apply directly. Executive, professional, and managerial level positions usually involve more complex recruitment processes like head - hunting or using recruitment agencies.

Answer:

D. blue - collar jobs