Under the Occupational Safety and Health Act, which of the following is true?

A$.$ When the general duty clause applies, an employer does not need to comply with an applicable safety standard.

B$.$ If an employer provides required personal protective equipment, then it has complied with the general duty clause.

C$.$ An employer must comply with an applicable safety standard as well as the general duty clause.

D$.$ When a safety standard applies, an employer must comply with it$,$ but not with the general duty clause.