What frequency range does the radio frequency (RF) spectrum encompass?

The radio frequency (RF) spectrum encompasses a wide range of frequencies that are utilized for various forms of wireless communication. The correct option indicates that the RF spectrum spans from 3 kHz to 300 GHz. This range includes several important categories of radio waves, such as very low frequency (VLF), low frequency (LF), medium frequency (MF), high frequency (HF), very high frequency (VHF), ultra high frequency (UHF), super high frequency (SHF), and extremely high frequency (EHF). These categories facilitate a diverse array of applications, including AM and FM radio, television broadcasting, mobile communications, and radar systems.

The reason the other frequency ranges provided are not correct is that they either fail to cover the full extent of RF transmission frequencies or only include a narrow segment of the overall RF spectrum. For example, the range from 0 Hz to 5 kHz pertains to audio frequencies rather than radio frequencies, while 1 kHz to 30 MHz, though it overlaps with some RF applications, does not encompass the higher frequencies important for many modern communications. The range from 30 GHz to 1 THz also focuses on a segment of the spectrum that is much too high and excludes lower RF frequencies that are