Consider the following sets of electron quantum numbers $($n$,$ l$,$ ml$,$ms$).$ Which one could not occur? a$)(1,0,0,+1/2)$ b$)(1,0,0,-1/2)$ c$)(3,2,-2,+1/2)$ d$)(3,2,3,-1/2)$ e$)(4,2,0,+1/2)$