What is the difference between Synchronous and Asynchronous updates? (Multiple Answer)

A. In synchronous processing, the program waits: control returns to the program only when the task has been completed.
B. In asynchronous processing, the program does not wait: the system returns control after merely logging the request for execution.
C. In asynchronous processing, the program waits: control returns to the program only when the task has been completed.
D. In synchronous processing, the program does not wait: the system returns control after merely logging the request for execution.

Ans:  A,B

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