select the correct statement
i) Cake filters separate relatively large amounts of solids as a cake of crystals ii) In cake filtration, after brief initial period the cake of solids does the filtration, not the septum
iii) In clarifying filters, the pores of filter medium are much larger in diameter than the particles to be removed iv) A precoat filter is a modified form of a rotary-drum filter
a) i) & ii) only b) i),ii) & iv) only c) i) & iv) only d) all of the above
b) i),ii) & iv) only
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