What is the ground-state electron configuration of gallium (Ga), written using noble-gas shorthand?

• A. $\left[Ar\right]4^{s}24^{p}3$
• B. $\left[Ar\right]4^{s}23^{d}104^{p}1$
• C. $\left[Ar\right]4^{s}23^{d}94^{p}2$
• D. $\left[Kr\right]5^{s}24^{d}105^{p}1$

Answer: (B)