Which of the following is true about Web Services RPC?
A - Web services allow clients to invoke procedures, functions, and methods on remote objects using an XML-based protocol.
B - Remote procedures expose input and output parameters that a web service must support.
C - A web service supports RPC by providing services of its own, equivalent to those of a traditional component, or by translating incoming invocations into an invocation of an EJB or a .NET component.
D - All of the above.
