Which of the following best describes Venin's theorem in the context of electrical circuits?
A. Venin's theorem states that any linear electrical network can be replaced by an equivalent circuit consisting of a single voltage source and a single resistor in series.
B. Venin's theorem explains the relationship between the voltage and current in a capacitive reactance circuit.
C. Venin's theorem describes the process of converting a complex magnetic field into a simpler model for analysis.
D. Venin's theorem outlines the principles for calculating the energy stored in an inductive coil.