The computer at your email service provider that handles outgoing email messages is called the ____.

When the XHTML 1.0 validator reports that the end tag for an element is missing, it means that ____.

A. a two-sided tag is missing an end tag B. a one-sided tag was improperly entered C. either a or b D. none of the above

____ is a mechanism for defining a collection of attributes for the instantiation of a directory entry.

A. Object class (OC) B. Distinguished name (DN) C. Secondary identifying document (SID) D. Identifying characteristics (IC)