The WHO classification of subgroups of ALL uses which of these criteria to help define the categories?

When the space above a ceiling is designed as a return-air plenum, which of the following must the inspector ensure?

A. The space above the ceiling is protected by the sprinkler system B. The enclosure for the ceiling is constructed with a 2 hour rating C. Wires, ducts, pipes, and other materials are noncombustible or rated for plenum use D. Adequate provisions are made for venting smoke from a fire to the outside

Public health has a curative focus

Indicate whether the statement is true or false.