Final answer:
The page documenting a test of controls is associated with the review for effectiveness of control processes in an internal audit, as it evaluates how well the controls work in practice.
Step-by-step explanation:
If the first page selected by the supervisor documents a test of controls performed during the course of the engagement, it should be identified as part of the review for effectiveness of control processes. The test of controls is conducted to determine whether the controls in place are being applied in the manner intended and are effective in mitigating risks to an acceptable level. This process goes beyond simply assessing if controls exist (adequacy), as it evaluates how well they function over time.