Find the vector that must be added to the vector `hat(i)-2hat(j)+2hat(k)` and `2hat(i)+hat(j)-hat(k)` so that the resultant vector is a unit vector along the x-axis.

Options

A. `2hat(i) + hat(j) -hat(k)`
B. `-2hat(i) + hat(j) - hat(k)`
C. `2hat(i) - hat(j) + hat(k)`
D. `-2hat(i) - hat(j) - hat(k)`

Answer

B