Explanation:

• The Yamuna River originates from the Yamunotri Glacier near Banderpoonch peaks in the Mussourie range of the lower Himalayas at an elevation of about 6,387 meters above the mean sea level in district Uttarkashi (Uttarakhand).
• The important tributaries of the Yamuna River are the Tons, the Chambal, the Hindon, the Sarda, the Betwa and the Ken. Smaller tributaries of the Yamuna River include Rishiganga, the Uma, the Hanuman Ganga, the Giri, the Karan, the Sagar and the Rind.
• The main Yamuna and Tons are fed by glaciers, viz., the Bandar Punch Glacier and its branches and originate from the Great Himalayan range.
• CPCB monitors water quality of River Yamuna and drains discharging into the River.
• CPCB has issued directions to Delhi Jal Board to submit time bound action plan to ensure compliance to norms by STPs and that no untreated sewage is discharged to these drains.

Hence option 4th is correct.