(D) The principal quantum number $n = 4$ indicates the shell is $4$.For the azimuthal quantum number $l$,the values correspond to orbitals: $l = 0$ $(

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(D) The principal quantum number $n = 4$ indicates the shell is $4$.For the azimuthal quantum number $l$,the values correspond to orbitals: $l = 0$ $(s)$,$l = 1$ $(p)$,$l = 2$ $(d)$,and $l = 3$ $(f)$.Since $l = 3$,the electron is in an $f$ orbital.Combining $n = 4$ and $l = 3$,the electron is in the $4f$ orbital.