In a three-tier architecture, what is the relationship between the presentation, application, and data tiers?

In a three-tier architecture, what is the relationship between the presentation, application, and data tiers?
A . They are independent and do not interact
B . Each tier communicates directly with the other two
C . Only the presentation tier interacts with the application tier
D . The data tier is isolated from the other two tiers

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Answer: B