The points on the surface x2−2y2−3z2 = 33 at which the tangent plane is parallel to the 8x+4y+6z=5 plane are: a. (1,0,1) y (2,3,1) b. (-4√3, √3, -√3) and (-4√3, -√3, √3)  c. (4√3, -√3, -√3) and (-4√3, √3, √3)  d. (-4√3, -√3, -√3) and (-4√3, -√3, √3)

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