From north towards South, which one of the following is the correct sequence of the given rivers in India? [IAS 2006] (a) Shyok - Spiti - Zaskar - Sutlej (b) Shyok - Zaskar - Spiti - Sutlej (c) Zaskar - Shyok - Sutlej - Spiti (d) Zaskar - Sutlej - Shyok – Spiti