The Nurse Is Participating in a Clinical Drug Trial Comparing

The nurse is participating in a clinical drug trial comparing two drugs for migraine headaches.Each group is randomly assigned to either drug A or drug B and then switched to the other drug group before being asked to compare the effects.This is an example of which type of study?

A) Crossover design
B) Double-blind experimental design
C) Matched pair design
D) Quasi-experimental design