rpc security model B in sybase 16.0

Dear All
Along with saying hello, I would similar to cognize if it is imaginable to activate the "rpc information exemplary B" enactment successful sybase 16.0 successful SYB_BACKUP,
since "sp_serveroption SYB_BACKUP, "rpc information exemplary B", true" does not enactment for maine and says that it does not find the SYB_BACKUP base.
When querying sp_helpserver if SYB_BACKUP appears.
Pay attraction to your comments