Shavon sees that the number she's working with is a terminating decimal. She then concludes that her number is rational. What mistake, if any, did she make?

Shavon is incorrect; she should determine whether or not the number is positive because then it might be irrational.
Shavon is incorrect; she needs to determine if there were any square roots involved because then it's irrational.
Shavon is correct; a terminating decimal is always rational.
Shavon is incorrect; a terminating decimal is always irrational.