Gunther is becoming frustrated with the television in his hotel room. He wants to scan through the channels very rapidly, but each time he switches the channel he has to wait a full two seconds before he can change it again. During that brief delay, it is impossible to change the channel. This is similar to how the __________ works in neural communication.
a) regenerative timeout
b) potential gradation
c) absolute refractory period
d) relative refractory period

Absolute refractory theory defines about time of action potential where any other action potential cannot get initiated through stimulus towards neuron irrespective of strength and size .

According to the question, absolute refractory period is being described through wait that occurs between switching of channel.This wait cannot be overcomed even though channel is switched forcefully or rapidly for change because it is acting as action potential.

Other options are incorrect because potential gradation, relative refactor period and regenerative timeout does display action potential during certain time period where other stimulus cannot invoke another action potential irrespective of its strength.

Thus, the correct option is option(c).