Which clearance listed is an example of an abbreviated IFR clearance?

An abbreviated IFR clearance is a streamlined version of the full IFR clearance, typically used to expedite the departure process. In this context, the example given where N2JEP is cleared to the Fargo Airport "as filed" while maintaining 4,000 feet represents an abbreviated clearance because it indicates that the pilot can follow the flight plan filed without further detail or modification. The phrase "as filed" means that all standard procedures and routes have been pre-approved and no additional instructions are necessary for the pilot to follow, making it a succinct and efficient clearance.

The other scenarios involve additional complexities or lack certain elements typical of an abbreviated clearance. For instance, a clearance that includes several detailed instructions or specific altitudes usually aims to provide more guidance based on air traffic control needs, rather than allowing for the simplicity of an abbreviated clearance. Therefore, in the context of flying under IFR and understanding the nature of different clearance formats, the first option stands out as an appropriate example of an abbreviated IFR clearance.