Police obtain 127 days of a suspect's historical cell-site location records from his carrier without a warrant. Under Carpenter v. United States, the records are:
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A
Obtained in violation of the Fourth Amendment, because accessing extended historical CSLI is a search requiring a warrant
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B
Lawfully obtained under the third-party doctrine
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C
Lawfully obtained because the records belong to the carrier
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D
Lawful if a subpoena was issued