Ports that hold strategic importance for national security and defense are known as Naval Ports. These ports are primarily used by the Navy for docking warships, conducting military operations, and maintaining maritime security.
Option A: Packet Stations — Refers to ports used for passenger or cargo ships, not defense.
Option B: Industrial Ports — Focus on the import/export of industrial goods.
Option C: Comprehensive Ports — Handle multiple types of cargo and passengers, but not specifically strategic.
Option D: Naval Ports — Correct answer; used for national defense and military purposes.
So, the correct answer is (D): Naval Ports.