Each work process is assigned a type of task that can be performed. Which statements related to this are true? Select all that apply.
选项：

A:To switch a work process type requires a restart of the SAP NetWeaver AS for ABAP.
B:All work processes have the same structure.
C:All work processes communicate with the database.
D:All work processes communicate with the dispatcher.
E:A work process can communicate directly with an external system through a Remote Function Call.
F:It is possible to have multiple enqueue work processes on an SAP NetWeaver Application Server. G:It is possible to have multiple spool work processes on an ABAP application server.