Which scenario requires a developer to use an Apex callout instead of Outbound Messaging?

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Which scenario requires a developer to use an Apex callout instead of Outbound Messaging?
A . The callout needs to be asynchronous.
B. The callout needs to be invoked from a Workflow Rule.
C. The Target system uses a REST API.
D. The Target system uses a SOAP API.

Answer: C