Theauditor must gather sufficient and appropriate evidence during thecourse of the audit. Sufficient evidence must:()

A、bewelldocumentedandcross-referencedintheauditdocuments.
B、bebasedonsourcesthatareexternaltocompany.
C、provideevidencethatproveordisproveanauditobjective/assertion.
D、bepersuasiveenoughtoenabletheauditortoissueanauditreport.