Choose all true statements.

A rational number can be written as a fraction of integers, and natural numbers such as 1 are rational, so B is true. Whole numbers (0, 1, 2, ...) are all integers, making D true; natural numbers are also integers, so E is true. A is false because numbers such as √2 are real but irrational. C and F are false because irrational real numbers exist, and some rational numbers, such as 1, are integers.

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