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(d) $\mathbf { i } \operatorname { coeff } ( \mathrm { f } ) \mathbf { j } \operatorname { coeff } ( \mathrm { g } ) \mathbf { k }$

A)
$\frac { 1 } { \text { leadcoeff( } ( d a 1 \mathrm { fac } ) \sqrt { \text { da 1 rad } } } \left( \right.$ leadcoeff( $\left. \left. \mathrm { a } ^ { * } \mathrm {~d} \right) \mathbf { i } \operatorname { coeff } \left( \mathrm { b } ^ { * } f \right) \mathbf { j } \operatorname { coeff } \left( \mathrm { c } ^ { * } g \right) \mathbf { k } \right)$
B)
$\frac { 1 } { \text { leadcoeff } ( d a 2 f a c ) \sqrt { d a 2 r a d } } \left( \right.$ 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 $\left( a ^ { * } d \right) \mathbf { i } \operatorname { coeff } \left( b ^ { * } f \right) \mathbf { j } \operatorname { coeff } \left( c ^ { * } g \right) \mathbf { k }$