BE and CF are two medians of $\triangle ABC$ and G the centroid. FE cuts AG at O. If OG = 2 cm, then the length of AO is

BE and CF are two medians of $\triangle ABC$ and G the centroid. FE cuts AG at O. If OG = 2 cm, then the length of AO is
1). 2 cm
2). 4 cm
3). 6 cm
4). 8 cm

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