Explanation: To monitor data at rest appropriately, the DLP solution would be installed on the host system where the data resides. A database server, in some situations, may be an appropriate answer, but the host system is the best answer because a database server is only one example of where data could reside. An application server processes data and typically sits between the data and presentation zones, and as such, does not store data at rest. A network firewall would be more appropriate for data in transit because it is not a place where data would reside.