The flexible wiring method between the time clock and the panel is permitted to be:

The correct answer is based on the flexibility and suitability of the wiring methods used to connect a time clock to a panel. The “I or II only” option represents electrical conduit types that are typically deemed acceptable in this scenario, namely flexible metallic conduit (FMC) or Liquidtight Flexible Nonmetallic Conduit (LFNC).

Using flexible metallic conduit allows for ease in installation, particularly in situations where accessing wiring may require maneuvering around obstacles. It is durable and provides a degree of protection against physical damage. Similarly, Liquidtight Flexible Nonmetallic Conduit is also suitable because it offers moisture resistance and is designed for environments where flexibility and environmental protection is necessary.

The other options would include types of conduit or combinations that may not meet the specific needs or regulations for this type of installation. Therefore, "I or II only" correctly indicates the appropriate choices, emphasizing the importance of adhering to guidelines for electrical installations that involve flexible connections. Each conduit type has specific applications and advantages, but both FMC and LFNC are generally accepted for use in connecting a time clock to a panel under the applicable codes.