Which of the following statement(s) is/are correct regarding Replication and Sharding?
Select one or more:
a. Master-slave replication reduces the chance of read-write conflicts.
b. Master-slave replication and sharding can not be combined.
c. By using sharding, each site acts as the single source for a subset of data.
d. Peer-to-peer replication and sharding can not be combined.
e. Peer-to-peer replication is a single point of failure.