This figure consists of a database icon labeled "Database" and three boxes labeled as follows:

• Application Tier A: 2.0

• Old Application Tier B: 1.5.3

• Application Tier C: 1.5.3

The boxes are lined up in one row. The database icon appears above the boxes. Double-headed arrows link each box with the database icon, except for "Old Application Tier B: 1.5.3", which does not have any arrows.

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