In a triangle ABC, AD is the bisector of angle A. If AC =4.2

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In a triangle ABC, AD is the bisector of angle A. If AC =4.2 cm, DC = 6 cm, BC =10 cm, find AB.

[MBA CMAT 2019]

A 2.7 cm

B 2.9 cm

C 2.8 cm

D 3.4 cm