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has a $3\mathrm{.}4$ NOx emission level, and issues a citation. On what grounds might Carlton fight this citation?

The federal statute preempts the state statute under the Supremacy Clause.

The state statute preempts the federal statute under the Supremacy Clause.

The federal statute preempts the state statute under the Full Faith and Credit Clause.

The state statute preempts the federal statute under the Full Faith and Credit Clause.