A simplified model requires both a web component available 99.9% and a database available 99.95%. Assume independent measured availability for this exercise. Which statement is valid?

Choose the single best answer.

A.The serial estimate is approximately 99.85%; real correlations and contractual SLA definitions limit the model
B.Multiply the values and treat the result as a contractual promise without examining definitions
C.Add the percentages to promise 199.85% application availability
D.Use the higher percentage as a guaranteed contractual application SLA

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✓ Correct answer

The serial estimate is approximately 99.85%; real correlations and contractual SLA definitions limit the model

0.999×0.9995=0.9985005, about 99.85%. Required serial dependencies reduce the independent modeled availability. Addition and choosing the higher value are invalid; mathematical estimates alone do not create contractual guarantees. Source guide: PDF page 42.

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