Replication for performance is important when the distributed system needs to scale in numbers and geographical area. a. true b. false Using synchronization variables to partly define consistency leads to what is called weak consistency. a. true b. false With mirrored Web sites and with cluster-based Web sites there generally are only a few replicas, which are more or less statically configured. a. true b. false In many situations, it is important that write operations are propagated in the correct order to all copies of the data store. This property is expressed in monotonic-write consistency. a. true b. false Widely used methods for improving distributed performance include: a. Replication b. Caching c. Both replication and caching d. Neither replication nor caching.