A purchase order Web service is designed to be synchronous, request-response, and HTTP-based. The existing service processes the request immediately. Because of new business requirements, the service can take up to ten days to perform a credit HTTP-based. The existing service processes the request immediately. Because of new business requirements, the service can take up to ten days to perform a credit check before processing the order. Which two design changes need to be made? (Choose two.)
A. The client needs to use dynamic proxies instead of stubs.
B. The client needs to develop and deploy a Web service to accept callbacks.
C. The service only needs to change the WSDL from rpc-literal to document-literal.
D. The client and the service need to establish a mechanism to correlate the messages.
E. Given delays of up to ten days, a polling strategy is more efficient than callback.
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