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Which writing system is traditionally used for the Mongolian language in Inner Mongolia?

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Wide autumn valley with golden grass in the foreground and low, tree-covered mountains of the Greater Khingan Range in the distance under a clear sky. — Inner Mongolia Da Hinggan (Greater Khingan) Range, southeast of Hailar, Inner Mongolia Autonomous Region, China.

The writing system traditionally used for the Mongolian language in Inner Mongolia is the Mongolian script, also known as Classical or Literary Mongolian.1

This script is derived from the Syriac alphabet via the Turkic Uyghurs and the Sogdians. It is characterized by its vertical orientation, written in columns from the top of the page down and from left to right, with letters taking different forms depending on their position within a word. While it represents the language as it was spoken during the era of Genghis Khan, it has remained a durable and functional written language for centuries.1