Which of the following documentation is not required for an audit in accordance with generally accepted auditing standards?
a. A written audit plan setting forth the procedures necessary to accomplish the audit objectives.
b. The assessment of the risks of material misstatement at both the financial statement and relevant assertion levels.
c. The basis for the auditor's decision to perform tests of controls concurrently with obtaining an understanding of internal control.
d. The auditor's understanding of the entity's control activities that help ensure achievement of management's objectives.
