The S-400 Triumf (Russian for Triumph) Missile System is ______ missile defense system designed in Russia.

surface-to-air

The correct answer is Option (2) - surface-to-air

The S-400 Triumf is a Russian-designed surface-to-air missile defense system. It's built to detect and destroy airborne threats such as aircraft and missiles. It's highly regarded for its long-range capability and ability to engage multiple targets simultaneously.