Which of the following sets of quantum numbers is not possible?

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:

In a multi-electron system,the energy of an electron of $2p_y$ orbital is :-

Which of the following sets of quantum numbers is not possible?

Which of the following orbitals is non-directional?

How many radial nodes are present in $4s$ and $3s$ orbitals respectively?