Based on the electron configuration exceptions of chromium and copper, predict the behavior of silver (Ag) in terms of electron configuration.

Silver will promote an electron from the 4d orbital to the 5s orbital, resulting in 5s² 4d⁹.

Silver will not promote any electrons, resulting in 5s² 4d⁹.

Silver will promote an electron from the 5p orbital to the 4d orbital, resulting in 5s² 4d¹⁰.

Silver will promote an electron from the 5s orbital to the 4d orbital, resulting in 5s¹ 4d¹⁰.