What is required for a pilot to operate under Instrument Flight Rules (IFR)?

To operate under Instrument Flight Rules (IFR), a pilot must possess specific training and have received a rating from the Federal Aviation Administration (FAA). IFR flying requires a higher level of skill and knowledge than Visual Flight Rules (VFR), as it involves navigating and controlling the aircraft solely by reference to instruments rather than outside visual cues. The training includes understanding how to read and interpret various flight instruments, as well as mastering navigation and communication protocols under IFR conditions.

Additionally, the FAA requires pilots to pass written and practical examinations to ensure they have the necessary competencies to operate safely in potentially challenging environments, such as flying in poor visibility or adverse weather conditions. This regulatory framework is designed to uphold safety standards in aviation.

The other options, while they might contribute to a pilot's overall training and skillset, do not specifically satisfy the requirements mandated for IFR operations.