If the electronic configuration of elements A' and B' are $$1s^{2}, 2s^{2} 2p^{6}, 3s^{1} $$ and $$1s^{2}, 2s^{2} 2p^{6}, 3s^{2}3p^{4} $$, respectively, then the formula of the compound forced by the combination of these elements will be: 

A

$$AB_{3}$$

B

$$AB_{2}$$

C

$$A_{2}B$$

D

AB