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15. A certain series RLC circuit with a 200 Hz, 15 V ac source has the following values: R = 12 Ω, C = 80 μF, and L = 10 mH. The total impedance, expressed in polar form, is ________.
(a) 12.28 ∠12.34° Ω
(b) 12.57 ∠12.34° Ω
(c) 9.95 ∠12.34° Ω
(d) 12.62 ∠12.34° Ω
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