For Administrators creating new Service Catalog items, what is a characteristic they should know about Service Catalog variables?

For Administrators creating new Service Catalog items, what is a characteristic they should know about Service Catalog variables?
A . Service Catalog variables can only be used in Record Producers
B . Service Catalog variables can only be used in Order Guides
C . Service Catalog variables cannot affect the order price
D . Service Catalog variables are global by default

Answer: D