$($:$[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19]\}$

${42}^n$

Which of the following is true about quality control standards?

A$.$ Quality control standards affect the performance of a firm's practice overall, not the performand engagement.

B$.$ Quaity control standards do not apply to attestation engagements.

C$.$ A firm that does not have an adequate system of quality control may stil have complied with prof specific engagement.

D$.$ The control environment is one of the qualify control standards.