A news article contains words many people may not know. The writer suggests creating a pop-up window, so when one of those word is clicked, the definition will appear. Which feature provides the most effective way to emphasize words requiring pop-up windows?

Boldface makes the unfamiliar vocabulary words stand out from the surrounding text, helping readers recognize that they can click those words for a definition. Double-spacing the article or indenting whole paragraphs would not clearly identify the specific words with pop-up windows.

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