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The direction ratios of the bisector of ...

The direction ratios of the bisector of the angle between the lines whose direction cosines are `l_1,m_1,n_1 and l_2,m_2,n_2` are
(A) `l_1+l_2,m_1+m_2+n_1+n_2`
(B) `l_1-l_2,m_1-m_2-n_1-n_2`
(C) `l_1m_2-l_2m_1,m_1n_2-m_2n_1,n_1l_2-n_2l_1`
(D) `l_1m_2+l_2m_1,m_1n_2+m_2n_1,n_1l_2+n_2l_1`

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