An electron in the 3s orbital of bromine is shielded from the nucleus primarily by the:
(a) electrons in the 1s orbital
(b) electrons in the 2s and 2p orbitals
(c) electrons in the 3p and 3d orbitals
(d) electrons in the 1s, 2s, and 2p orbitals
(e) electrons in the 1s, 2s, 2p, 3p, and 3d orbitals