10. þ A and D. Dispatchers maintain the connection to user processes, place
requests on the common queue, and retrieve result sets from response queues.
ý B, C, and E. B is wrong because each dispatcher has its own response
queue. C is wrong because it is the listener that load-balances, not the
dispatchers. E is wrong because the connections to a dispatcher are persistent:
if it dies, they will be broken.
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