With time redundancy, an action is performed, and then, if need be, it is performed again. a. true b. false In contrast to reliability, availability is defined in terms of a time interval instead of an instant in time. a. true b. false Lost Reply Messages can be handled using a timer that has been set by the client's operating system. If no reply in forthcoming within a reasonable period, just send the request once more. a. true b. false Maintainability refers to how easily a failed system can be repaired. a. true b. false In SESAME, the collection of general security components handling authentication, authorization, and key distribution for distributed system may be co-located on a single machine, which would be known as the Domain Security Server (DSS) . a. true b. false