Check all statements that are true.

Since it is a terminating decimal, 16.9 is rational.
Since 81 is a perfect square, 81 is irrational.
Since it is a ratio of two integers, 4/3 is irrational.
Since it is a repeating decimal, 19.79 is rational.
Since 3 is not a perfect square, 3 is irrational.
None of the above statements are true.