Answer : 3. "ISRO"
Explanation :

Recently ISRO has developed the second generation Distress Alert Transmitter (DAT) which increases safety for fishermen at sea. In operation since 2010, more than 20,000 DATs are in use by ISRO. This technology allows fishermen to send emergency messages with real time through satellite communication. DAT-SG, an enhanced version, uses advanced capabilities and features. The messages decoded at the Indian Mission Control Center help the Maritime Rescue Coordination Centers to locate distressed boats for timely search and rescue operations, thereby assuring fishermen of imminent assistance.