what foundation to use for my slabs?

[nikon70]

what foundation to use for my slabs?

scalpings, sand and cement dry mix

scalpings, sand

sand and cement dry mix

cement from a cement truck ready mixed poured in

sand only

it is 54m long and slabs 600x600 1.5" from wickes

i have dug a trench and compacted the soil.


help thanks.