搜索引擎体系中的Caching模块起缓冲作用，将反复被查的查询及查询结果缓冲在Caching模块。

Which of the following is MOST likely to improve the performance of SOAP-based Web services？（） A:  Use message level security B:  Use fine-grained Web services C:  Use document/literal instead of RPC/encoded D:  Avoid stale data in the UDDI registry by turning off caching