If you drive an oscillator, it will have the largest amplitude if you drive it at its frequency. If you drive an oscillator, it will have the largest amplitude if you drive it at its frequency. pendulum positive damped resonant special

The correct option is Resonant Frequency

Explanation:

If you drive an oscillator, it will have the largest amplitude if you drive it at its resonant frequency.

The resonant frequency is the frequency at which an object resonates at his natural frequency and has highest amount of output at this frequency.

Example:

In electrical RLC circuits, There exists a certain frequency at which the effect of L and C are canceled by each other and the circuit will have a maximum output at this stage, the frequency is called Resonant frequency.