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You are trying to determine the appropriate level of high availability for a server. the server must be available on a constant basis, and downtime in a given year cannot exceed 1 hour. it normally takes you about 45 minutes to bring down and restart the server for maintenance. which of the following reflects the level of availability you require?
a. 99.999 percent availability
b. 99.9 percent availability
c. 99.99 percent availability
d. 99 percent availability

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