How many total orbitals are present in the $4f$ subshell?

The explanation for the presence of three unpaired electrons in the nitrogen atom can be given by

Find the number of electron pairs in $P$ atom with $l = 1$ and $m = 0$.

For a magnetic quantum number $m = 0, \pm 1$,the value of the principal orbital (azimuthal quantum number $l$) corresponds to which subshell,and what is the minimum principal quantum number $n$ required for this set?

Which of the following elements has the outer electronic configuration $3s^2 3p^5$?

The plots of radial distribution functions for various orbitals of hydrogen atom against $r$ are given below.
The correct plot for $3s$ orbital is