Regarding system high availability, what is the reference used to determine reliability?
A. the amount of data available to users and how quickly they can access it, measured in IOPS
B. the number of hard drives available in a system, with more drives indicating more reliability
C. the number of data network components available between the data and the user, measured in packet per second (PPS)
D. the number of nines; for example, two nines (99), three nines (99.9), four nines (99.99), and five nines (99.999)
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