A typical flexible pavement consists of four components, which are given in the alternatives below. The correct order of arrangement from bottom to top level is____________.
1
surface Level, soil subsoil, sub base level, base level
2
soil sub-level, sub-base level, base level and surface level
3
base level, surface level, soil sub level and sub base level
4
sub-base level (radda), soil sub-level, surface level and base level