Consider the following statements:
1. In a super-passage, the drain runs over the canal.
2. In a siphon, the drain runs below the canal.
3. In a siphon aqueduct, type-II, the canal banks are made of RCC walls.
Which of these statements are correct?1
1 only
2
1 and 2 only
3
2 and 3 only
4
1 and 3 only