A state law requires all public school teachers to be U.S. citizens. A lawful permanent resident denied a teaching job challenges the law. The law is most likely:
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A
Valid under the public function exception to strict scrutiny for alienage classifications
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B
Invalid because alienage classifications always receive strict scrutiny
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C
Invalid under the Privileges or Immunities Clause of the Fourteenth Amendment
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D
Valid only if Congress has approved it