L-shaped wall

T-shaped wall

counterfort type

all of the above

1.5

2

2.5

3

(i) and (ii)

(i)and(iv)

(ii) and (iii)

(iii) and (iv)

one cantilever

two cantilevers

three cantilevers

four cantilevers

the front face in one direction

the front face in both directions

the inner face in one direction

the inner face in both directions