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A data type can be specified with a clear type quantification by explicitly stating the type of data that can be stored in a variable or object. This can be done in programming languages by using keywords such as int for integers, string for text, float for decimal values, and so on. The type quantification can also define the range of acceptable values, the size of the data, and other restrictions on the data type. Additionally, a data type can be specified using strong typing, which ensures that the type of data stored in a variable or object is consistent throughout the code, thereby reducing errors and improving reliability.