What is the correct order of increasing basicity for the bases $NH_3$, $CH_3NH_2$, and $(CH_3)_2NH$ in aqueous solutions?

Question

$NH_3 < CH_3NH_2 < (CH_3)_2NH$

$CH_3NH_2 < NH_3 < (CH_3)_2NH$

$NH_3 < (CH_3)_2NH < CH_3NH_2$

$CH_3NH_2 < (CH_3)_2NH < NH_3$

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