Which of the following plots of radial probability function $4\pi r^2 \Psi ^2$ is incorrectly labelled?

In a multielectron atom,which of the following orbitals described by three quantum numbers will have the same energy in the absence of electric and magnetic fields?
$A: n=1, \ell=0, m_{\ell}=0$
$B: n=2, \ell=0, m_{\ell}=0$
$C: n=2, \ell=1, m_{\ell}=1$
$D: n=3, \ell=2, m_{\ell}=1$
$E: n=3, \ell=2, m_{\ell}=0$
Choose the correct answer from the options given below:

What is the total number of orbitals present in $N$ shell?

The number of electrons in the outermost shell of an element with atomic number $15$ is . . . . . . .

How many values of magnetic quantum number are possible for each value of azimuthal quantum number?

Which of the following has non-spherical electron orbitals?