Choose the correct statement

Question

$\begin{array}{1 1} \text{a.A switch is the source of electric current in a circuit} \\ \text{ b. A switch helps to complete or break the circuit} \\ \text{ c. A switch helps us to use electricity as per our reuirement} \\ \text{ d. When the switch is open there in an air gap between its terminals.} \end{array}$