Silica, lead, and asbestos standards all share which common employer requirement?

Explanation

All three standards are built on the same frame: determine the exposure, apply engineering and work-practice controls to bring it down, add respiratory protection where the controls cannot reach the limit alone, train the workers, and provide medical surveillance once the action level or the limit is exceeded - so assessment, controls and training are common ground. The wrong answers are genuine requirements attached to one of the three only. Air clearance sampling (c) is asbestos practice and has no counterpart in the silica standard. Registration with the Division (a) applies to asbestos-related work in California, alongside certification under Business and Professions Code section 7058.5, but not to silica or lead work as such. And owner or neighbour notification (d) comes from environmental and renovation rules, not from these health standards.