In IBM BPM, what needs to be done to use an external service in a Service Flow?

In IBM BPM, what needs to be done to use an external service in a Service Flow?
A . Use a Modify Task activity type to invoke an operation of the external service
B . Use a Service Task activity type to invoke an operation of the external service
C . Use a Decision activity type to invoke the rules of an external service
D . Use a Content Integration Task activity type to invoke an operation of the external service

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Answer: C