In ACORD's InsurTech API framework, what distinguishes a 'synchronous' transaction from an 'asynchronous' transaction?
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A
Synchronous transactions require human approval; asynchronous do not
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B
Synchronous transactions wait for an immediate response, while asynchronous transactions use callbacks or polling for delayed responses
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C
Synchronous transactions use XML; asynchronous use JSON
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D
Synchronous transactions are more secure than asynchronous transactions