Answer:B. The Auditor should attempt to understand the entity and it's environment, Including Internal controls as early as practical through the analysis of the accounting system, test of controls and substantive test of transaction.
Step-by-step explanation:
The first major duty of the Auditor is to understand the entity and it's environment to determine it's inherent risks, to evaluate the existing Internal controls to determine it's workability which invariably determines the level of substantive test to be carried out.
The test of sales and cash receipt thus not hereald an audit work but are carry out to confirm the strength or weakness of the internal control already documented.