Discussion
Consider the following statements about storage classes.
1. Colder classes cost less per gigabyte to store.
2. Colder classes cost more or take longer to retrieve.
3. The cheapest class is always the right choice.
Answer: D
The first two are correct and describe the trade. The third ignores retrieval cost, which can easily exceed the storage saving for data that is actually read. Access frequency decides the class. Storage price is only half the sum.
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