Review this excerpt from the article about Journeymen. “A journeyman is commonly expected to have a wide range of experience, covering most fields of their trade. For example, a non-journeyman worker of some 20 or 30 years' experience may have most or all of their experience in only residential, commercial, or industrial applications. A journeyman, however, has a broad field of experience in residential, commercial, and industrial applications.”
The references to the experienced non-journeyman worker–
a. describe the fields of study common for journeymen
b. show there’s no need to become a journeyman
c. reinforce the idea that learning on the job is a positive practice
d. highlight the broad skill set of a journeyman