Police attach a GPS tracker to a suspect's car without a warrant and monitor his movements for 28 days. Under United States v. Jones, this conduct is:
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A
Not a search, because movements on public roads are exposed to the public
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B
Not a search, because cars have a reduced expectation of privacy
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C
A Fourth Amendment search, because the physical attachment to the vehicle was a trespass to obtain information
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D
A search only if the monitoring exceeds 30 days