Which of the following statements is true?

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(D) In the energy band theory of solids:$1$. $A$ conductor has a conduction band that is partially filled with electrons, or the valence band and cond

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$A$ solid is a conductor, if its conduction band is partially filled

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(D) In the energy band theory of solids:$1$. $A$ conductor has a conduction band that is partially filled with electrons, or the valence band and conduction band overlap.$2$. An insulator has a large energy gap between the valence band and the conduction band, and the conduction band is completely empty at $0 \ K$.$3$. $A$ semiconductor has a small energy gap between the valence band and the conduction band, and the conduction band is empty at $0 \ K$ but can be partially filled at higher temperatures.Therefore, the statement that a solid is a conductor if its conduction band is partially filled is correct.

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