Consider the following statements:
(1) Coulomb earth pressure theory does not take the roughness of wall into consideration.
(2) Active earth pressure on a retaining wall decreases due to increase in wall friction.
(3) Rankine theory of earth pressure assumes that back of wall is vertical and smooth
Of these statements
1
1 and 2 are correct
2
3 and 1 are correct
3
2 and 3 are correct
4
1, 2 and 3 are correct