（）are the three different coatings which can protect metal from corrosion.<br>A:Cement wash, bitumen and paint<br>B:Metal primers, undercoats and topcoats<br>C:Varnishes, heat-resistant paints and anti-fouling paints<br>D:Cement wash, primer and undercoat

（）are the three different coatings which can protect metal from corrosion.
A:Cement wash, bitumen and paint
B:Metal primers, undercoats and topcoats
C:Varnishes, heat-resistant paints and anti-fouling paints
D:Cement wash, primer and undercoat

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