Which of the following may cause receive interference to an HF transceiver installed in a vehicle?

Modern vehicles are packed with electronics and mechanical systems that generate significant radio frequency (RF) noise. The battery charging system, specifically the alternator, typically generates a whining noise that changes pitch with the engine's RPM. In addition to the alternator, the fuel delivery system relies on electric fuel pumps that can produce a continuous broadband whine or buzzing sound. Finally, a vehicle's control computers (ECUs) use fast digital switching circuits that radiate digital pulses and hash across the HF spectrum. Because all of these systems emit electromagnetic interference (EMI) that a sensitive HF receiver can easily pick up, they are all notorious for causing receive interference in mobile setups.