Which best describes headers and footers? headers are located at the bottom of a page, and footers are located at the top of a page. headers are located at the top of a page, and footers are located at the bottom of a page. headers are edited at the same time as the main content, and footers are not able to be edited at the same time as the main content. headers are not able to be edited at the same time as the main content, and footers are edited at the same time as the main content.