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George is assisting a prosecutor with a case against a hacker who attempted to break into the computer systems at George's company. He provides system logs to the prosecutor for use as evidence, but the prosecutor insists that George testify in court about how he gathered the logs. What rule of evidence requires George's testimony?

A. Testimonial evidence rule B. Parol evidence rule C. Best evidence rule D. Hearsay rule

Using only Armstrong’s axioms and the FDs

(a) AB ? C (b) A ? BE (c) C ? D give a complete derivation of the FD A ? D.