A(n) ____ key is a field in one table whose values are required to match the primary key of another table.

An unusual advertisement on your computer screen that pops up is usually caused by ________

A) adware or spyware B) a Trojan horse C) keystroke loggers D) antivirus software

A(n) ________ document that includes directions for how the document should display in a web browser

A) HTML B) linked C) summary D) crosstab