Which statement best defines the term “sidebar”?

A sidebar is a short piece of text that provides information about a subtopic in a nonfiction article.
A sidebar is a short piece of text that provides information about the main topic in a nonfiction article.
A sidebar is a long piece of text that provides information about a subtopic in a nonfiction article.
A sidebar is a long piece of text that provides information about the main topic in a nonfiction article.