Generally Accepted Auditing Standards Recognize Two Categories of Evidential Matter

Generally accepted auditing standards recognize two categories of evidential matter: underlying accounting data and corroborating information. In making an audit in accordance with GAAS:

A) corroborating information is always required, while underlying accounting data may be gathered under certain circumstances.
B) underlying accounting data must always be gathered, while corroborating information need only be obtained when the accounting records are not reliable.
C) both categories are required.
D) the auditor may choose the category to use, and omit the other.
E) neither category is required.