Atomic Structure: JEE Main 2025 Chemistry question

Correct statements for an element with atomic number 9 are A. There can be 5 electrons for which $m_s = +\frac12$ and 4 electrons for which $m_s = -\frac12$. B. There is only one electron in $p_z$ orbital. C. The last electron goes to orbital with $n = 2$ and $l = 1$. D. The sum of angular nodes of all the atomic orbitals is 1. Choose the correct answer from the options given below: