Answer : The correct option is, (3) the anode in both a voltaic cell and an electrolytic cell.
Explanation :
As we know that there are two types of cell which are, electrolytic cell and voltaic cell.
Electrolytic cell : It is a cell in which the chemical reaction occurs by passing of the current from external source.
In this electrolytic cell, the oxidation occurs at anode which is a positive electrode and reduction occurs at cathode which is a negative electrode.
Voltaic cell : It is defined as a device which is used for the conversion of the chemical energy produces in a redox reaction into the electrical energy. It is also known as the galvanic cell or electrochemical cell.
In the voltaic cell, the oxidation occurs at an anode which is a negative electrode and the reduction occurs at the cathode which is a positive electrode.
Hence, the oxidation occur in a voltaic cell and in an electrolytic cell at the anode in both a voltaic cell and an electrolytic cell.