Four 100 ohm resistors and a 1 V battery are connected as shown in the circuit diagram. The potential difference between points P₁ and P₂ is given by
a) 0.250 V; b) 0.333 V; c) .500 V; d) 0.667 V.
[Figure: Circuit diagram showing four 100Ω resistors and 1V battery with points P₁ and P₂ marked]