trusses only

beam only

rigid frames only

any type of structure

mechanically formed sedimentary rock

igneous rock

chemically precipitated sedimentary rock

metamorphic rock

sand stone

lime stone

shale

gypsum

only (iii)

both (i) and (iii)

both (ii) and (iii)

all (i), (ii) and (iii)

silicious rock

argillaceous rock

calcareous rock

aqueous rock