Answer : 
                                               
                                                                                                                                                                                                                        - A) SharePoint sites 
B) Exchange 
C) OpenSearch 1.0/1.1 
 All of the above 
                                                                                                  
                                            
                                               Explanation : 
                                               
                                           A. Incorrect: SharePoint sites are the default for a results source but serve as only one of many result sources available.
    B. Incorrect: Exchange Server is an available results source when the Exchange Web Services Managed API is installed on the