Brahmaputra and Indus rivers are antecedent rivers. Which one of the following may be the true definition of an antecedent drainage?

An antecedent drainage system refers to a river that established its course before the current topography was uplifted. Key characteristics include:

• Pre-existence: The river existed before the mountain range (like the Himalayas) began to rise.
• Erosion: As the land was uplifted, the river maintained its original path by cutting down into the rising landmass at a rate equal to or faster than the uplift.
• Geological Features: This process results in the formation of deep, narrow V-shaped valleys or gorges.

The Indus, Brahmaputra, and Sutlej are prominent examples that cut through the Himalayan ranges, proving they are older than the mountains themselves.