An Officer Who Uses a Flash Light to Look Inside

An officer who uses a flash light to look inside the front seat of a locked,illegally parked automobile on a public street and notices a bag of marijuana on a front seat has:

A) conducted an illegal search because he enhanced his normal senses with a flashlight.
B) conducted an illegal search because he looked into the windows of a locked car.
C) not conducted a search at all and his actions are not in violation of the Fourth Amendment because the marijuana was in plain view.
D) conducted a legal search because under the Fourth Amendment he can use a flashlight.