Specialty (Class C) licence classifications are set by statute and Board regulation. Which of the following is the BEST description of what a C-specialty licence authorizes?

Explanation

§7058(a) defines a specialty contractor by craft: operations requiring special skill whose principal business is a specialized building trade. The individual classifications come from the board's regulations — 16 CCR §832 runs C-2 through C-61 — and 'incidental and supplemental' is defined at 16 CCR §831 and echoed in §7059(a), which lets a specialty contractor take a contract using two or more trades only where the other trades are incidental and supplemental to the one it is licensed for. (a) is exactly the self-assessment the classification system exists to replace. (b) ignores that general engineering is its own classification under §7056, with its own experience and examination. (d) confuses the scope of a licence with the §7048 minor-work exemption, which is about who needs a licence at all, not about what a C licence covers.