What should a pilot check if an IAP does not specify an IAF with a defining NAVAID?

When an Instrument Approach Procedure (IAP) does not specify an Initial Approach Fix (IAF) with a defining NAVAID, it is crucial for the pilot to consult the terminal procedures for details. This step is necessary because terminal procedures often provide additional guidance on how to initiate the approach, including alternative fixes or navigational aids that can be used as entry points for the approach.

By reviewing the terminal procedures, the pilot can ensure that they fully understand the approach and are aware of any necessary details regarding the entry into the procedure, including appropriate altitudes, routing, or communication frequencies. This understanding is essential for maintaining safety and adhering to regulatory requirements during the approach phase of flight.

While other choices may appear valid, they do not encompass the full scope of information that terminal procedures provide, which is specifically designed to ensure safe and efficient navigation in the vicinity of an airport during various phases of flight.