_______ describes how data should look on a web site; ______ describes data being exchanged between business partners.

In order to add and join tables in a select query, depending on how a table is created, the primary key fields:

A) must be defined. B) may or may not be defined. C) must be defined as a single field primary key. D) must not be defined.

What element is used to create a line that helps break up elements on a page?

A) B) C) D)