A dc voltage equal to π V_dc π is applied to a resistor of π RΩ π. A sinusoidal voltage equal to π v_s π is also applied to a resistor of π RΩ π. Select the correct expressions that show that the dc
a) π V_dc = v_s π
b) π V_dc = 0 π
c) π V_dc = v_s + R π
d) π V_dc = R π