Which of the following statements are correct about service asynchronous and synchronous execution?

The synchronous execution service will return the service running result.

The asynchronous execution service initiates the service invoking, but does not return the service execution result.

The asynchronous execution service is slow, and the synchronous execution service is fast.

The difference between synchronous execution and asynchronous execution is that the synchronous execution will return the result after the service is executed completely, while the asynchronous execution will return the result directly.