In an XS Advanced project, what is the purpose of the .hdiconfig file?

In an XS Advanced project, what is the purpose of the .hdiconfig file?
A . To specify an external schema in which calculation views will get their data
B. To specify which HDI plug-ins are available
C. To specify the namespace rules applicable to the name of database objects
D. To specify in which space the container should be deployed

Answer: B