True or False: A manager or designated manager must be present at all times during cosmetology services.

The correct response indicates that a manager or designated manager must be present at all times during cosmetology services. This requirement is based on the regulations governing cosmetology establishments in Tennessee, which stipulate that a licensed professional must oversee operations to ensure compliance with health and safety standards, as well as to maintain customer service and quality control.

Having a manager present helps safeguard that all services provided are performed by appropriately licensed individuals and that the establishment adheres to the laws set forth by the Tennessee Board of Cosmetology. This oversight is integral in maintaining the integrity of the practice and ensuring that clients receive safe, professional, and high-quality services.

The other options suggest varying degrees of manager presence that do not align with the legal expectations set by the state's regulations. It is essential in the cosmetology profession to always have that managerial oversight to uphold the standards expected by both the board and the clientele.