Answer: Option (a) is the correct answer.
Step-by-step explanation:
In an electrochemical cell, electrodes are connected to the circuit of the cell.
Electrodes consist of an anode and a cathode. Anode is negatively charged and cathode is positively charged. In an electrochemical cell, oxidation takes place at anode, that is, loss of electrons. Whereas reduction takes place at cathode, that is, addition of electrons.
Hence, electrons travel from anode to cathode leading to the generation of electric current.
Therefore, we can conclude that electrodes is a part of the cell which are used to connect an electrochemical cell to a circuit.