Which one of the following is not an Air Defence Missile system?

Based on the provided evidence, Akash and Trishul are indigenous surface-to-air missile (SAM) systems developed by the DRDO under the Integrated Guided Missile Development Programme (IGMDP). Specifically, Akash is a medium-range SAM capable of targeting aircraft up to 30 km away, while Trishul is a short-range SAM. Astra is India's first indigenous beyond-visual-range (BVR) air-to-air missile, which also functions as part of an aerial combat and defense suite. In contrast, Tatra is not a missile system but a renowned manufacturer of heavy-duty military trucks and chassis. Tatra vehicles serve as the logistics backbone for various armies and provide the mobile platforms or chassis for mounting missile launchers and howitzers, rather than being the weapon system itself. Therefore, Tatra is the only option that is not an air defense missile system.