You have an Exchange Server 2016 organization. The organization contains a mailbox database
named DB1. DB1 is stored on a volume named Volume1. You plan to use Exchange Native Data
protection. You need to recommend a solution to prevent Volume1 from running out of space for
transaction logs. What should you recommend?

A.
an event history retention period

B.
background database maintenance

C.
circular logging

D.
a size limit of the log directory for the managed folders

Explanation:
https://technet.microsoft.com/en-us/library/mt697598(v=exchg.160).aspx