Which of the following statements relates to a retarding reservoir?1. There are no gates at the outlets and hence the possibility of human error in reservoir operation is eliminated.2. The high cost of gate installation and also its operation is saved.3. An automatic regulation may cause coincidence of flood crest farther downstream where two or more channels taking off from retarding reservoirs join together.

• A. 1, 2 and 3
• B. 1 and 2 only
• C. 1 and 3 only
• D. 2 and 3 only