The spelling of a compound word can change over time as the compound word becomes more common. How does the spelling usually change? Select the best answer.

A solid compound word usually becomes a hyphenated compound word $($e$.$g$.,$database$$ to $$data$-$base$).$

A hyphenated or separate compound word usually becomes one solid word $($e$.$g$.,$email$$ instead of $$e$-$mail$).$

A separate compound word usually stays separate $($e$.$g$.,$Web page$$ stays $$Web page$).$