A battery whose internal resistance is negligible can be joined between any two of the points $P$, $Q$, $R$ and $S$ in the resistor network shown. Which pairings will produce the greatest current and the least current in the battery?
- Alargest current: $PQ$, smallest current: $PR$
- Blargest current: $PQ$, smallest current: $QS$
- Clargest current: $RS$, smallest current: $PR$
- Dlargest current: $RS$, smallest current: $QS$