The correct answer is: d) All of the above
Lepcha is a Sino-Tibetan language spoken by about 50,000 people in Sikkim, India, and Bhutan. It has its own unique script, tonal system, and grammar.
The Lepcha script is called Chhokey, and it is written from left to right. It is a phonetic script, which means that each letter represents a single sound. The Lepcha script is not related to any other writing system, and it is thought to have developed independently.
The Lepcha tonal system is complex, with five tones: high, low, rising, falling, and falling-rising. The tone of a word can change its meaning, so it is important to be able to distinguish between the different tones.
The Lepcha grammar is also complex, with a number of different noun cases and verb conjugations. The language has a rich vocabulary, and it is used in both spoken and written form.
Lepcha is a beautiful and unique language, and it is an important part of the cultural heritage of Sikkim and Bhutan.