The shearing strain component in Z-X plane is ________

• A. ( _{xz} = frac{ w}{ y}+ frac{ v}{ z} )
• B. ( _{xz} = frac{ v}{ x}- frac{ w}{ y} )
• C. ( _{xz} = frac{ u}{ z}+ frac{ w}{ x} )
• D. ( _{xz} = frac{ v}{ y}- frac{ w}{ x} )