Resonance frequency

The above left is an RLC series circuit, where the resistance of the resistor, the self-inductance of the inductor and the capacitance of the capacitor are RR, LL and CC, respectively. The above right shows the current intensity as a function of the frequency of the AC power supply, where f0f_0 is the resonance frequency of this circuit. Which of the following methods can make the resonance frequency greater than f0f_0?

a) Replacing the inductor with one that has an inductance greater than L.L.
b) Replacing the capacitor with one that has a conductance greater than C.C.
c) Connecting more capacitors with capacitance CC in series to the existing capacitor.

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