When discussing network reliability, what does the term “five nines” mean?

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When discussing network reliability, what does the term “five nines” mean?
A . The network is up 99.999% of the time.
B . The network is up .99999% of the time.
C . The network is up 9.9999% of the time.
D . The network is up .09999% of the time.

Answer: A