Find two unit vectors orthogonal to
a=<−1,2,2> and b=<−2,5,−2>. Enter your answer so that the first non-zero coordinate of the first vector is positive.
a) ⟨2,1,−1⟩ and ⟨2,−1,−1⟩
b) ⟨−1,2,2⟩ and ⟨2,1,−1⟩
c) ⟨−2,−1,1⟩ and ⟨1,2,−2⟩
d) ⟨2,−1,−1⟩ and ⟨−2,−1,1⟩