You use Microsoft .NET Framework 4.0 to develop an application that exposes a WCF Data Services endpoint. The endpoint uses an authentication scheme that requires an HTTP request that has the…

You use Microsoft .NET Framework 4.0 to develop an application that exposes a WCF Data Services endpoint. The endpoint uses an authentication scheme that requires an HTTP request that has the following header format. GET /OData.svc/Products(1) Authorization: WRAP access_token "123456789" You add the following method to your DataService implementation. 01 protected override void OnStartProcessingRequest(ProcessRequestArgs args) 02 { 03 .... 04 } You need to ensure that the method retrieves the authentication token. Which line of code should you use?