Which should be taken into consideration when configuring a scalable service?

Which should be taken into consideration when configuring a scalable service?

A.
Data must be on global file system, file locking is managed from PXFS.

B.
Data can be on a local highly available file system and accessed using cluster interconnect.

C.
Data must be on a global file system, file locking must be managed from Application.

D.
Data can be on a global file system, file locking is managed from PXFS.