Maximum number of electrons in a subshell with $l = 3$ and $n = 4$ is

Which of the following electronic configurations has the maximum total spin multiplicity?

Given:
$(A)\ n = 5, m_l = +1$
$(B)\ n = 2, l = 1, m_l = -1, m_s = -1/2$
The maximum number of electron$(s)$ in an atom that can have the quantum numbers as given in $(A)$ and $(B)$ are respectively:

For an atom with atomic number $Z = 25$,determine the total number of $s$ electrons present.

The number of angular and radial nodes of $4d$ orbital respectively are

The set of principal $(n)$,azimuthal $(l)$ and magnetic $(m_l)$ quantum numbers that is not allowed for the electron in $H$-atom is