Two resistors, R1 and R2, are connected to an ideal battery. Initially, a switch in the branch containing R2 is open, so only R1 is in the circuit. An ideal ammeter is placed in series with R1, and an ideal voltmeter is connected across the entire resistor network. With the switch open, the ammeter reads I0 and the voltmeter reads V0. The switch is then closed, adding R2 in parallel with R1. Which of the following best describes the subsequent meter readings?
(a) The ammeter reading remains I0, and the voltmeter reading remains V0.
(b) The ammeter reading increases above I0, and the voltmeter reading remains V0.
(c) The ammeter reading increases above I0, and the voltmeter reading decreases below V0.
(d) The ammeter reading decreases below I0, and the voltmeter reading remains V0.