(A) : ${\mathrm{d}}_{{\mathrm{z}}^2}$ orbital has no nodal plane
(R) : In ${\mathrm{d}}_{{\mathrm{z}}^2}$ orbital a smoke ring is present in yz plane

Both ‘A’ and ‘R’ are true and ‘R’ is the correct explanation of ‘A’.

‘A’ is true but ‘R’ is false

Both 'A' and 'R' are false

Both ‘A’ and ‘R’ are true and ‘R’ is not the correct explanation of ‘A’