In VIP security, counter surveillance is very important. Which of the following is/are essential for counter surveillance ?

1. Try speeding up, and then slow down
2. Walk into a building and stop abruptly
3. Drop something to see if someone picks it up

Select the correct answer using the code given below :

Counter-surveillance (or surveillance detection) involves specific maneuvers designed to identify if a person or vehicle is being followed by hostile elements. Statement 1 describes a standard technique where changing speed forces a surveillance team to also change speed to maintain contact, making their presence more obvious. Statement 2 involves entering a building or turning a corner and stopping abruptly; this forces a "tail" to either walk past the target or stop suddenly, thereby revealing themselves. Statement 3 is a "trigger" maneuver; dropping an item tests if a follower reacts to the target's actions or attempts to retrieve the item to maintain a cover of being a helpful bystander. All three are recognized tactical maneuvers used by security professionals to "dry clean" a route and detect hostile surveillance patterns.