An investigator identifies that stolen funds landed in a deposit address at a U.S.-based exchange. What is the best first legal step to keep the account records from being deleted while formal process is prepared?
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A
Email the account holder asking for cooperation
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B
Send a preservation request under 18 U.S.C. § 2703(f)
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C
Post the address on social media to warn the public
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D
Wait until a grand jury subpoena is issued