According to your text, mashup apps are designed based on three "tiers". The data tier is where information is stored and retrieved from a database or file system.

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This statement is true. Mashup apps are designed based on three tiers: the data tier, the logic tier, and the presentation tier. The data tier is where information is stored and retrieved from a database or file system.

According to Your Text, Mashup Apps Are Designed Based on Three