Explanation:

- Option 1, Ten Degree Channel: The Ten Degree Channel separates the Andaman Islands from the Nicobar Islands. It lies at approximately 10° north latitude in the Indian Ocean.

- Option 2, Six Degree Channel: This channel is located between the Great Nicobar Island and the northern tip of Sumatra.

- Option 3, Eight Degree Channel: The Eight Degree Channel, also known as the Lakshadweep Channel, separates the Laccadive Islands of India from the Maldives.

- Option 4, Twelve Degree Channel: There is no widely recognized Twelve Degree Channel relevant to these islands.