Structure of Atom Part 2

Correct statements for an element with atomic number 9 are
A. There can be 5 electrons for which m s=+‌

1

2

and 4 electrons for which m s=−‌

1

2

B. There is only one electron in pz orbital
C. The last electron goes to orbital with n=2 and I=1
D. The sum of angular nodes of all the atomic orbitals is 1
Choose the correct answer from the options given below :