A tuning fork of frequency 256 Hz will resonate with another tuning fork of frequency :
(a) 128 Hz (b) 256 Hz
(c) 384 Hz (d) 512 Hz.
Two tuning forks are struck and the sounds from each reach your ears at the same time. One sound has a frequency of 256 Hz, and the second sound has a frequency of 258 Hz. The underlying beat frequency is: