The correct option is D 4d, 6s respectively
1. n = 4, l = 2
Given quantum numbers are:
Priniciple quantum number; n = 4 mean 4th shell
Azimuthal quantum number; l = 2 mean d-subshell
So, 4d is the subhell.
2. n = 6, l = 0
Given, quantum numbers are:
Priniciple quantum number; n = 6 mean 6th shell
Azimuthal quantum number; l = 0 mean s-subshell
So, 6s is the subhell.
Hence the correct option is (d).