Which one of the following Himalayan rivers does NOT originate from ac

Which one of the following Himalayan rivers does NOT originate from across the Himalayas ?

Indus
Satluj
Ganga
Brahmaputra
This question was previously asked in
UPSC NDA-1 – 2017
The Ganga river does NOT originate from across the Himalayas.
Rivers originating ‘across the Himalayas’ are also known as Trans-Himalayan rivers. Their sources lie on the northern side of the Great Himalayan range, typically in Tibet.
– Indus originates near Mansarovar lake in Tibet.
– Satluj originates from Lake Rakshastal near Mansarovar in Tibet.
– Brahmaputra originates from Chemayungdung Glacier in Tibet.
– Ganga originates from the Gangotri Glacier in Uttarakhand, India, which is on the southern slopes of the Great Himalayas. The main headstream is Bhagirathi, which meets Alaknanda at Devprayag to form the Ganga.
The Trans-Himalayan rivers (Indus, Satluj, Brahmaputra) are older than the Himalayas and have cut deep gorges through the mountains. Himalayan rivers (like Ganga and Yamuna) originate south of the main range.