Which of the following is a general principle relating to the reliability of aud

Which of the following is a general principle relating to the reliability of audit evidence?a. Audit evidence obtained from indirect sources rather than directly is more reliable than evidence obtained directly by the auditor.b. Audit evidence provided by copies is more reliable than that provided by facsimiles.c. Audit evidence obtained from knowledgeable independent sources outside the client company is more reliable than audit evidence obtained from nonindependent sources.d. Audit evidence provided by original documents is more reliable than audit evidence generated through a system of effective controls.