Explanation:

1, 2, & 4

The Brahmaputra River System. The river Brahmaputra originates in Himalayan Lake Manasarover in Tibet to the outfall in the Bay of Bengal.
The source of the Sutlej is west of catchment area of the Lake Rakshastal in Tibet, as springs in an ephemeral stream.
The Indus River (also called the Sindhu) is one of the longest rivers in Asia. It flows through China (western Tibet), India (Ladakh) and Pakistan. Originating in the Tibetan Plateau in the vicinity of Lake Manasarovar, the river runs a course through the Ladakh region of India.