Which of the following regarding the shapes of d-orbitals is not correct
1
\(\rm d_z^2\) is a dumb-bell shaped curve symmetric about z-axis with a ring like collar in xy plan
2
\(\rm d_z^2-y^2\) is double dumb-bell shaped with signs of the lobes on y-axis will always be positive.
3
dxy is double dumb-bell shaped
4
A 3d orbital would have no radial node