Activity List Vs Activity Attributes


Is Activity Attribute a Document or an attribute of an activity in the activity list ?

How can i answer this

Which document has th extension description of  the activity.

a) Activity Attribute

b) Activity list



Please refer pg 350 from PMBOK 4th Edition. Activity attibutes themselves form a project document.

Thanks.. Appendix A has the difference between the project management plan and the project documents.

I skipped  those appendixes to look