The unit vector normal to the surface x2y + 2zx = 4 at the point (2, -2, 3) is-
1
\(\rm \frac 1 3 \left( -\hat i + 2\hat j + 2\hat k \right)\)
2
\(\rm -\frac 1 3 \left( \hat i + 2\hat j + 2\hat k \right)\)
3
\(\rm \frac 1 3 \left( \hat i - 2\hat j + 2\hat k \right)\)
4
\(\rm \frac 1 3 \left( 2\hat i + \hat j + \hat k \right)\)