Consider the following statements : 
a. Electron density in $xy$ Plane in  $3d{x}^2-y^2$ Orbital is zero 
b. In H-like species, the energy of orbitals depends only on the ‘n’ value.
c. 2𝑠 orbital has only one spherical node 
d. For 2p_z orbital $yz$ Is the nodal plane. 
The correct statements are