Which of the following statements is true regarding respirator standard requirements that apply when respirators with tight-fitting face pieces are required to be worn? a) Employers are not required to provide medical evaluations for employees wearing tight-fitting respirators b) Fit testing is not necessary for employees wearing tight-fitting respirators c) Employers are not required to provide training on the proper use of tight-fitting respirators d) Employers must establish a respiratory protection program including medical evaluations, fit testing, and training for employees wearing tight-fitting respirators