What problem would you have when enabling the following SBO method as a web service?

A.
You cannot use an array as return types for a web service.

B.
You cannot instantiate a DfClientX object in an SBO web service.

C.
The call to getSession will always return null when called from within an SBO web
service.

D.
An IDfSysObject cannot be passed as an argument to a web service.