Which oxides are acidic?

I.     \({{\text{P}}_{\text{4}}}{{\text{O}}_{{\text{10}}}}\)

II.     \({\text{S}}{{\text{O}}_{\text{3}}}\)

III.     \({\text{N}}{{\text{a}}_{\text{2}}}{\text{O}}\)

A.     I and II only

B.     I and III only

C.     II and III only

D.     I, II and III

A