The drawing shows four situations in which two very long wires are carrying the same current, although the direction of the currents may be different. The point P in the drawings is equidistant from each wire. Which one (or more) of these situations gives rise to a zero net magnetic field at P?

( a ) 2 and 4

( b ) Only 1

( c ) Only 2

( d ) 2 and 3

( e ) 3 and 4