Which two statements are true about configuring service tasks? (Choose two.)
A. A service task can be configured to invoke a process or service asynchronously.
B. Although you call a file adapter as a service from your BPMN diagram, no linkage between your BPMN process and the external reference appears in the SOA Composite Editor.
C. You can invoke a BPEL process by using a service task.
D. The implementation of a service task can be either a process call or a service call.