A user is taken through a series of Web pages in an online store and eventually checks out to
complete his purchase. In the event of a server failure, the user should not have to repeat a step
that has already been performed. Which session management strategy is best suited if the user
cannot tolerate a loss in session information?

A.
Database persistence to external datastore

B.
Memory–to-memory replication in Both mode

C.
Memory–to-memory replication in Client mode

D.
Memory–to-memory replication in Server mode