From two vases that each contain purple and yellow tulips, a florist randomly selected two tulips. If the selection constituted an independent event, then the florist must have selected

Select one:

a.one purple tulip and one yellow tulip from the second vase

b.one tulip from the first vase and one tulip from the second vase

c.both tulips from the same vase

d.two tulips of the same colour from the first vase