multi-valued properties specify the auxiliary classes that the class inherits from.</td></tr>
</tbody></table>
</div>
<h2 id="class-categories"><a class="header" href="#class-categories">Class Categories</a></h2>
<p>There are three class categories in Active Directory.</p>
<p><em>Structural</em> classes are the most basic type of AD class and are the only classes which can be instantiated directly, i.e. one can create objects from them. These classes are allowed to inherit from abstract classes as well as o