A theme in WordPress is $...$

Open$-$source software, free or paid, does not provide design and content management tools, and helps build a site quickly.

Open$-$source software, free or paid, provides design and content management tools, and helps build a site quickly.

Not open$-$source software, free or paid, provides design and content management tools

Open$-$source software, always paid, provides design and content management tools, and helps build a site quickly.