An element $X$ belongs to the fourth period and fifteenth group of the periodic table. Which of the following statements is true?
- AIt has a completely filled $s$-orbital and a partially filled $d$-orbital.
- BIt has completely filled $s$- and $p$-orbitals and a partially filled $d$-orbital.
- CIt has completely filled $s$- and $p$-orbitals and a half-filled $d$-orbital.
- DIt has a half-filled $p$-orbital and completely filled $s$- and $d$-orbitals.
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