A unit vector perpendicular to each of the vectors 2î - ĵ + k̂ and 3î - 4ĵ - k̂ is

• A. \(\frac{1}{{\sqrt 3 }}\hat i + \frac{1}{{\sqrt 3 }}\hat j - \frac{1}{{\sqrt 3 }}\hat k\)
• B. \(\frac{1}{{\sqrt 2 }}\hat i + \frac{1}{2}\hat j + \frac{1}{2}\hat k\)
• C. \(\frac{1}{{\sqrt 3 }}\hat i - \frac{1}{{\sqrt 3 }}\hat j - \frac{1}{{\sqrt 3 }}\hat k\)
• D. \(\frac{1}{{\sqrt 3 }}\hat i - \frac{1}{{\sqrt 3 }}\hat j + \frac{1}{{\sqrt 3 }}\hat k\)