Find a Unit Vector Orthogonal To $\mathbf { u }$ And $\mathbf { v }$

Find a unit vector orthogonal to $\mathbf { u }$ and $\mathbf { v }$ .
$\mathbf { u } =$ leadcoeff(a) i $\operatorname { coeff } ( b ) \mathbf { j } \operatorname { coeff } ( \mathrm { c } ) \mathbf { k } , \mathbf { v } =$ leadcoeff $( \mathrm { d } ) \mathbf { i } \operatorname { coeff } ( \mathrm { f } ) \mathbf { j } \operatorname { coeff } ( \mathrm { g } ) \mathbf { k }$

A) $\frac { 1 } { \text { leadcoeff(da 1 fac } ) \sqrt { \text { da 1 rad } } } ($ leadcoeff(a* $\left. d ) \mathbf { i } \operatorname { coeff } \left( b ^ { * } f \right) \mathbf { j } \operatorname { coeff } \left( c ^ { * } g \right) \mathbf { k } \right)$
B) $\frac { 1 } { \text { leadcoeff(da } 2 \text { fac } ) \sqrt { \text { da } 2 \text { rad } } } \left( \right.$ leadcoeff $\left. \left( a ^ { \wedge } 2 \right) \mathbf { i } \operatorname { coeff } \left( b ^ { \wedge } 2 \right) \mathbf { j } \operatorname { coeff } \left( c ^ { \wedge } 2 \right) \mathbf { k } \right)$
C) leadcoeff(b* $\left. g - c ^ { * } f \right) \mathbf { i } \operatorname { coeff } \left( - a ^ { * } g + c ^ { * } d \right) \mathbf { j } \operatorname { coeff } \left( a ^ { * } f - d ^ { * } b \right) \mathbf { k }$
D) $\frac { 1 } { \text { leadcoeff(wfac) } \sqrt { w r a d } } \left( \right.$ leadcoeff $\left. \left( b ^ { * } g - c ^ { * } f \right) \mathbf { i } \operatorname { coeff } \left( - a ^ { * } g + c ^ { * } d \right) \mathbf { j } \operatorname { coeff } \left( a ^ { * } f - d ^ { * } b \right) \mathbf { k } \right)$
E) leadcoeff( $\left. a ^ { * } d \right) \mathbf { i } \operatorname { coeff } \left( b ^ { * } f \right) \mathbf { j } \operatorname { coeff } \left( c ^ { * } g \right) \mathbf { k }$