What are the configuration options for search providers?

What are the configuration options for search providers?
A . ES: Provider for Enterprise Search
B . AD: Provider for address search based on BAS-DES
C . DB: Provider for database search
D . The Fuzzy Search Using Addresses link is not available by default in the work center in SAP Portal or in SAP NetWeaver Business Client.
E . Free Text: Provider supports free-text search and MDG displays a corresponding field in the UI
F . Fuzzy: Provider supports error-tolerant search and MDG display

Answer: A,B,C,E,F