employer on the grounds

Grace was fired by her employer on the grounds that she always showed up late to her work shifts. Assuming that the law of employment-at-will holds in the given scenario, which of the following statements is most likely true?
Grace can get her job back using the A????1implied contractA????1 exception to employment-at-will.
Grace should accept the decision, because the company did nothing illegal.
Grace can get her job back using the A????1public policyA????1 exception to employment-at-will.
GraceA????1s employer is committing the most commonly seen federal crime.

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