Arrange the following layers of flexible pavement from top to bottom :

(a) Sub-base course

(b) Base course

(c) Surface course

(d) Sub-grade

1
(c), (a), (d), (b)
2
(c), (b), (d), (a)
3
(c), (a), (b), (d)
4
(c), (b), (a), (d)

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