Abehavioral economist studies transportation habits in an urban center. she identifies 4 bus routes that connect to 3 different light rail routes available to participants in the studybefore she interviews participants, she must determine the number of possible routes participants can choose to use.

which expression represents the number of available options ?

a) 4x3
b) 4! +3
c)4! /3!
d) 4! x3!
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