An atom of element A has three electrons in its outer shell and B has six electrons in its outermost shell. The formula of the compound formed between these two will be :

Question

$\begin{array}{1 1} (a)\;A_4B_4 \\(b)\;A_2B_2 \\(c)\;A_1B_2 \\ (d)\;A_2B \end{array}$