In ΔABC, D and E are points on AB and AC respectively such that DE || BC and DE divides the ΔABC into two parts of equal areas. Then ratio of AD and BD is

• A. : 1
• B. : $$\sqrt 2 $$ - 1
• C. : $$\sqrt 2 $$
• D. : $$\sqrt 2 $$ + 1