Answer: Option (C) is the correct answer.
Explanation:
An inert electrode is defined as an electrode that releases electrons or which serves as a sink for electrons. An inert electrode does not participate chemically in the electrode reaction.
For example, in a voltaic cell anode is negatively charged and cathode is positively charged. So, electrons release from the anode and they get deposited on the cathode.
This leads to generation of electric current.
Therefore, we can conclude that the purpose of the inert electrode is to conduct electrons.