What is the purpose of placement groups (PGs) in a Ceph cluster?

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What is the purpose of placement groups (PGs) in a Ceph cluster?
A . To distribute data across OSDs for redundancy and performance.
B . To manage access control for different storage pools.
C . To synchronize data between MDS instances in a CephFS.
D . To monitor the health and availability of MON nodes.

Answer: A