Which of the following is correct for $2p$-orbitals?

Five valence electrons of $P^{15}$ are labelled as $\boxed{AB}_{3s} \,\boxed{X|Y|Z}_{3p}$. If the spin quantum numbers of $B$ and $Z$ are $+\frac{1}{2}$,the group of electrons with three of the quantum numbers $(n, l, m)$ the same are:

The angular momentum of an electron in a $d$ orbital is equal to:

The energy of an electron of $2p_y$ orbital is

The number of unpaired electrons in cobalt atom is (atomic number of $Co = 27$)

Which of the following is correct on the basis of Hund's rule but does not follow Pauli's principle?