I need part C answered Consider an electrically neutral iron

I need part C answered.

Consider an electrically neutral iron atom, whose atomic number is 26. The atom has electrons in which of the following sets of shells When a vacancy, or hole, occurs in the K shell, one electron from an outer energy shell makes a transition to fill the hole. The result of this transition is the emission of an X - ray photon, called a K X ray. which has a definite wavelength, as indicated by the appearance of a line in the spectrum. How many lines will be in the spectrum of iron when K X rays are emitted If one electron is knocked out from the L shell of an iron atom, leaving behind a vacancy, or hole, from what energy shells can an electron make a transition to fill the hole and emit an L X ray

Solution

When vacancies are produced in the n=1 or K-shell of the atom and electrons drop down from above to fill the gap. The x-rays produced by transitions from the n=2 to n=1 levels are called K-alpha x-rays, and those for the n=31 transition are called K-beta x-rays.

n=3 is the M shell and n=4 is the N shell.

Transitions to the n=2 or L-shell are designated as L x-rays (n=32 is L-alpha, n=42 is L-beta, etc. ). So the answer will be option (3) and (4)