Identify which of the following is the gradient vector ∇f\nabla f∇f for f(x,y,z)=x2+y2+z2f(x, y, z) = x^2 + y^2 + z^2f(x,y,z)=x2+y2+z2.
⟨2x,2y,2z⟩\langle 2x, 2y, 2z \rangle⟨2x,2y,2z⟩
2x+2y+2z2x + 2y + 2z2x+2y+2z
⟨x,y,z⟩\langle x, y, z \rangle⟨x,y,z⟩
⟨2,2,2⟩\langle 2, 2, 2 \rangle⟨2,2,2⟩