Refer to Exhibit $6\mathrm{.}1.$ Auditing standards require the auditor to gather sufficient appropriate evidence to provide a reasonable basis for an opinion regarding the financial statements.

What are the characteristics of $($a$)$ sufficient audit evidence and $($b$)$ appropriate audit evidence?

How are sufficiency and appropriateness related to each other and with respect to risk?

Contrast how sufficiency and appropriateness of evidence would differ for a high$-$risk and a low$-$risk assertion.