What is the main benefit of the Indexing exclusions feature?

What is the main benefit of the Indexing exclusions feature?
A . it allows the administrator to exclude specific email domain items from being indexed
B . it allows the administrator to remove excluded content from previously archived items
C . it reduces the number of false positives in eDiscovery searches by excluding email footers
D . it reduces the number of false positives in eDiscovery searches by excluding listed archives

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Answer: C