A series LCR circuit has a resistor of 300 Ω, a capacitor of 0.2 μF, and an inductor of 8 mH. Find its impedance at resonance and the resonant frequency.
a) 300 Ω, 2 kHz
b) 400 Ω, 1 kHz
c) 500 Ω, 1.5 kHz
d) 600 Ω, 2.5 kHz