Two substances, A and B were made to react to form a third substance,

Two substances, $A$ and $B$ were made to react to form a third substance, $A_{2} B$ according to the following reaction

$2 A+B \rightarrow A_{2} B$

Which of the following statements concerning this reaction are incorrect?

(i) The product $\mathrm{A}_{2} \mathrm{~B}$ shows the properties of substances $\mathrm{A}$ and $\mathrm{B}$

(ii) The product will always have a fixed composition

(iii) The product so formed cannot be classified as a compound

(iv) The product so formed is an element.

(a) (i), (ii) and (iii)

(b) (ii), (iii) and (iv)

(c) (i), (iii) and (iv)

(d) (ii), (iii) and (iv).