Officer Ick saw Ack looking through the windows of a parked car. The officer then saw Ack picking up a rock. If Officer Ick had 'reasonable suspicion' that Ack was about to commit a crime, What may the officer do?
1) Detain Ack
2) Search Ack for evidence of a crime
3) Arrest Ack
4) Frisk Ack for weapons