ABCD is a rhombus whose side AB = 4 cm and $\angle ABC$ = $120^{0}$, then the length of diagonal BD is equal to:

ABCD is a rhombus whose side AB = 4 cm and $\angle ABC$ = $120^{0}$, then the length of diagonal BD is equal to:
1). 1 cm
2). 2 cm
3). 3 cm
4). 4 cm

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