The following statements (C1, C2, C3, C4) pertain to the characteristics of different type of canals. Which of the following statements is/are correct?
C1: A contour canal can irrigate command areas on both the banks.
C2: It is possible to construct a contour canal with banks on one side only.
C3: In the case of a ridge canal, the number of cross drainage works are maximum.
C4: Side slope canal is aligned roughly at right angles to the ground contours.
1. C2 and C4 only
2. C1, C3 and C4 only
3. C1 and C3 only
4. C1 only