What is the resonant frequency of circuit shown below?
Where $$R = 10 Ω, L1 = L2 = 20 mH$$, Mutual Inductance $$M = 5 mH, C = 0.05 \mu H$$.

A

4.18 kHz

B

2.88 kHz

C

5.18 kHz

D

3.18 kHz