Consider a scalar field f(x,y,z)=ln(x2+y2+z2)f(x, y, z) = \ln(x^2 + y^2 + z^2)f(x,y,z)=ln(x2+y2+z2). Identify the vector field that is equal to ∇⋅(∇f)\nabla \cdot (\nabla f)∇⋅(∇f).
2x2+y2+z2\frac{2}{x^2+y^2+z^2}x2+y2+z22
2(x2+y2+z2)2\frac{2}{(x^2+y^2+z^2)^2}(x2+y2+z2)22
000
2r2\frac{2}{r^2}r22 where r2=x2+y2+z2r^2 = x^2+y^2+z^2r2=x2+y2+z2