Bluetooth, which is a short-range communication technology, has been shown to be very difficult to attack.

Bluetooth is a wireless technology standard for exchanging data between fixed and mobile devices over short distances using short-wavelength UHF radio waves in the industrial, scientific and medical radio bands, from 2.400 to 2.485 GHz, and building personal area networks (PANs). It was originally conceived as a wireless alternative to RS-232 data cables.

Explanation:

radiant energy is a form of kinetic energy only.(a)

answer; make a no-nonsense accusation of the other;