Betty Trooper Owns and Operates a Realty Company

Betty Trooper owns and operates a realty company. She has provided you with properties.xml, which is a file that contains a list of properties enrolled in the multiple listing database. She has created three different versions of a schema for the properties vocabulary and needs help in choosing the most appropriate schema design for her needs.
-If Betty uses Flat Catalog design, the following is true:

A) all element and attribute definitions have global scope.
B) has only one global element with everything else nested
C) all element and attribute definitions have local scope.
D) has only one local element with everything else nested