Which of the following is a characteristics of asynchronous communication?

Which of the following is a characteristics of asynchronous communication?
A . This form of communication uses a single function call
B . SAP S/4HANA must be active on the sending systems and the receiving systems
C . The receiving system does NOT have to be available at the fine a function call is dispatched
D . It can be implemented in function calls that require an immediate return of data to the sender

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Answer: B