With reference to the Indus river system, of the following four rivers, three of them pour into one of them which joins the Indus direct. Among the following, which one is such river that joins the Indus direct?

1. The question describes the confluence pattern of the major tributaries of the Indus river system in the Punjab region. 2. The Jhelum river flows into the Chenab river. 3. The Ravi river also flows into the Chenab river. 4. The Beas river (not listed in the options but part of the system) flows into the Sutlej river. 5. The Sutlej river and the Chenab river (carrying waters of Jhelum and Ravi) then join at Panjnad in Pakistan. 6. The combined waters of these rivers, known as the Panjnad River, flow a short distance before joining the Indus river direct near Mithankot. 7. The question asks which of the four listed rivers receives the waters of the other three (indirectly) and then joins the Indus direct. Considering the final outflow into the Indus via the Panjnad, the Sutlej is often considered the river that carries the collective waters of the eastern tributaries to the Indus. Therefore, the Sutlej is the river that fits the description in the context of the options provided.