What type of electron orbital (i.e., s, p, d, or $\mathrm{f}$ ) is designated by an electron with quantum numbers
(a) $\mathrm{n}=1, \ell=0, \mathrm{~m}_{\ell}=0 ?$
(b) $\mathrm{n}=3, \ell=2, \mathrm{~m}_{\ell}=-1 ?$
(c) $\mathrm{n}=4, \ell=3, \mathrm{~m}_{\ell}=3$ ?