Which of the following statements with regard to drone swarms is/are correct ?<br/><br/>1. They use Terahertz band of frequency to communicate with the command centre.<br/>2. Individual drones in the swarm can communicate with other drones in the swarm.<br/>3. GPS Spoofing is a commonly used technique to counter drone swarm attack.<br/><br/>Select the answer using the code given below :<br/>

1 is incorrect: drone swarms are not defined by Terahertz links; authoritative overviews describe varied command-and-control methods, and common drone communication bands are typically in much lower GHz ranges, while THz is more of a future/research direction. 2 is correct: in distributed control, drones communicate and collaborate using shared information. 3 is best taken as correct: official counter-UAS guidance treats spoofing, including false GPS signals, as a soft-kill method to influence or divert drones. So 2 and 3 only.