Which of the following is true about all series ac circuits?
(a) The voltage across any circuit element is a maximum when the current is a maximum in that circuit element.
(b) The current at any point in the circuit is always the same as the current at any other point in the circuit.
(c) The current in the circuit is a maximum when the source ac voltage is a maximum.
(d) Resistors, capacitors, and inductors can all change the phase of the current.