Answer : 4. "December 4"
Explanation :

Answer: D) December 4 Explanation: On December 4, 1971, the Indian Navy successfully executed Operation Trident, which was a devastating attack on Pakistan Naval Headquarters in Karachi. The operation, which marked the first use of anti-ship missiles in the region, did irreparable damage to the Karachi port during the 1971 Indo-Pak war. To commemorate this, December 4 is celebrated as the Indian Navy Day. Every year to celebrate the achievements and role of the naval force to the country we clebrate Navy Day. The Indian Navy is the marine branch of the Indian Armed Forces and is led by the President of India as Commander-in-Chief.