Following a Stroke,a Client Has Been Started on Clopidogrel (Plavix)

Following a stroke,a client has been started on clopidogrel (Plavix) .Why is this medication being administered?

A) To prevent stroke in high-risk patients,such as those with prosthetic heart valves
B) To decrease blood pressure
C) To increase heart rate
D) To provide antiplatelet activity in patients who cannot tolerate aspirin