Which of the following is considered standard equipment on an aircraft?

The correct choice identifies a combination of equipment commonly regarded as standard for many aircraft, particularly in terms of navigation and communication. VHF RTF (Very High Frequency Radio Telephony), VOR (VHF Omnidirectional Range), and ILS (Instrument Landing System) are essential components that are typically included in an aircraft's standard suite of navigational and communication tools.

VHF RTF is crucial for voice communication between pilots and air traffic control, facilitating critical airspace management and flight instructions. VOR is a radio navigation system that enables pilots to determine their aircraft's position, providing reliable and accurate navigation guidance. ILS is vital for landing approaches, as it assists pilots in landing safely and precisely by providing both lateral and vertical guidance.

While other options contain important aviation systems, the mentioned equipment in the correct choice represents fundamental capabilities that are expected across a wide range of aircraft types, particularly those involved in commercial operations. This standardization is crucial for safety and operational consistency in the aviation industry.