You are developing a Windows Communication Foundation (WCF) service to provide an in- memory cache for many Web applications. The service contract is defined as follows. (Line numbers are included…

You are developing a Windows Communication Foundation (WCF) service to provide an in- memory cache for many Web applications. The service contract is defined as follows. (Line numbers are included for reference only.) 01 <ServiceContract()> 02 Public Interface IDataCache 04 . . . 05 End Interface 08 Public Class DataCache 09 Implements IDataCache 11 . . . 12 End Class You need to ensure that all users share the cache. Which code segment should you insert at line 07?