In a multielectron atom, which of the following orbitals described by three quantum numbers will have same energy in absence of electric and magnetic fields? A. n=1,l=0,m=0 B. n=2,l=0,m=0 C. n=2,l=1,m=1 D. n=3,l=2,m=1 E. n=3,l=2,m=0