A is correct.
Synchronous API calls are blocking calls that do not return until either the change has been completed or there has been an error. For asynchronous calls, the response to the API call is returned immediately with a polling URL while the request continues to be processed. In heavier load conditions, it can be more efficient to submit multiple async calls and periodically check the status than to wait for each call to complete before submitting the next one.
https://developer.cisco.com/docs/packaged-contact-center/#!synchronous-vs-asynchronous-writes/synchronous-vs-asynchronous-writes
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