What is replica metadata used for?

What is replica metadata used for?
A . Storinga set of VM configuration files
B . Storing replica temporary cache
C . Detecting changed blocks of data between two replica states

Answer: C

Explanation:

Replica metadata used to store replica checksums. Veeam Backup & Replication uses this file to quickly detect changed blocks of data between two replica states. A metadata file is written to the backup repository.