$\text {The velocity vector at a point in a fluid flow is given by \(5 \mathbf { i } + 12 \mathbf { j }\). The unit vector which is }$

$\text {The velocity vector at a point in a fluid flow is given by \(5 \mathbf { i } + 12 \mathbf { j }\) . The unit vector which is }$$\text {perpendicular to the streamline passing through the point is:}$

A) $( - 12 \mathbf { i } + 5 \mathbf { j } ) / 13$
B) $( - 12 \mathbf { i } = 5 \mathbf { j } ) / 13$
C) $( 5 \mathbf { i } + 12 \mathbf { j } ) / 13$
D) $( - 5 \mathbf { i } + 12 \mathbf { j } ) / 13$