Final answer:
Option 3, which involves testing the signatures on canceled checks to board of director's authorizations, is regarded as a test of control in auditing. Tests of control are conducted to evaluate the effectiveness of internal controls in preventing or detecting errors or fraud. This test assesses the effectiveness of the authorization control over cash disbursements.
Step-by-step explanation:
The question you've asked pertains to the field of auditing, specifically regarding the identification of tests of controls within an audit. A test of control is designed to evaluate the operating effectiveness of the controls in preventing or detecting and correcting material misstatements at the assertion level. Out of the options provided, option 3, which involves testing the signatures on canceled checks to board of director's authorizations, is considered a test of control. This test checks whether the system of authorizations is being followed and whether it is effective in preventing unauthorized disbursements.
Tests of specific items making up a balance (1), tests confirming receivables (2), and tests of additions to property, plant, and equipment by physical inspection (4) could be deemed substantive tests rather than tests of controls. Substantive tests are aimed at detecting material misstatements at the assertion level, whereas tests of controls assess the effectiveness of the control environment. By examining the signatures on canceled checks and comparing them to authorizations by the board of directors, auditors can assess whether controls over cash disbursements are being applied consistently and properly, which is foundational to an effective internal control system.