Which of the following is true about the Tibetans?
A.
The Tibetans are mainly distributed over the Qinghai-Tibet Plateau.
B.
The Tibetans live in houses with flat roofs due to the dry weather and lack of rain.
C.
The Tibetans welcome the guests with a snow-white hada and wish them a "zha-xi-de-le" meaning "good luck".
D.
The Tibetans believe in Tibetan Buddhism.