When you deselect part of your selection on purpose or accident, you can return to the previous section by using the ______ command.

CVE and the NVD both provide information about what?

A. Vulnerabilities B. Markup languages C. Vulnerability assessment tools D. Penetration testing methodologies

Making all functionality available from a keyboard is a practice that falls under the accessibility guidelines that state Web content must be __________________.

Fill in the blank(s) with the appropriate word(s).