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In `triangle ABC`, D and E are the points on AB and AC respectively such that AD x AC = AB x AE. If `angle ADE = angle ACB + 30^@` and `angle ABC = 78^@` , then `angle A`=?
त्रिभुज ABC में, D और E क्रमशः भुजा AB और AC पर स्थित ऐसे बिंदु हैं कि AD x AC = AB x AE है | यदि `angle ADE = angle ACB + 30^@` है तथा `angle ABC = 78^@` है, तो कोण A का मान क्या होगा ?

A

`56^@`

B

`54^@`

C

`68^@`

D

`48^@`

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