let surface be f(x,y,x) = 0
grad(f(x,y,z)) is the equation of the normal.
grad(f) = (0.5x^0.5,0.5y^0.5,0.5z^0.5)
put (x,y,z) = 4,9,9
grad(4,9,9)= (1,1.5,1.5)
equation of normal is (4,9,9) + k(1,1.5,1.5)
which is equivalent to (4,9,9) + k2(2,3,3)
Answer is none of the above
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