The half cells in an electrochemical cell are interconnected through

Explanation

In an electrochemical cell, half cells are separated but need to be connected for the flow of electrons and ions.A wire directly connecting the electrodes would simply short-circuit the cell, preventing the desired potential difference.An electric circuit can include the entire cell along with additional components, so it's not specific to the interconnection between half cells.No connection would not allow the flow of ions and electrons,preventing the cell from functioning.Therefore, a salt bridge is the specific medium used to connect the half cells while allowing the necessary ionic transfer without directly conducting electrons, which is crucial for the cell to operate.So the answer is (b) salt bridge.