According to Stoutenburg and Dilworth, what level of supervisors is designated as 3+++?

The designation of 3+++ refers specifically to a supervisor of supervisors, indicating an advanced level of responsibility and oversight within an organization. This level implies that the individual not only supervises others but also holds the authority and expertise to guide and evaluate the performance of those who themselves are in supervisory roles. Such a position typically requires a deeper understanding of management practices, leadership skills, and the ability to mentor other supervisors effectively.

In contrast, other levels described in the options do not capture the breadth of responsibility associated with a 3+++ supervisor. A supervisee with advanced skills, for example, may imply a highly skilled individual under supervision but not in a supervisor role themselves. Similarly, a peer supervisor refers to a colleague operating at the same level rather than a supervisory hierarchy and an entry-level supervisor would be at the beginning of their supervisory career, lacking the advanced qualifications and responsibilities inherent to the 3+++ designation.