[单选题]
08.26: If the principal qu: s aa28zk .fr)+gpj6 zdaznag3dk,* rantum number of og2y7 ( rsc,wahd50w, kv ecy:an electron is n=4, how many possible valuewy: 0s(r v y5aegw2kc,h,dc o7s of the orbital magnetic quantum number ml are there for this electron?