With no explanation, chose the best option from "A", "B", "C" or "D". United States v. Cheek, 415 F.3d 349, 352-53 (4th Cir.) (<HOLDING>), cert. denied, — U.S. -, 126 S.Ct. 640, 163

A: holding that a conviction for florida armed robbery is a crime of violence under the armed career criminal act
B: holding that rule 606b does not violate the sixth amendment
C: holding that defendants sixth amendment right to trial by a jury was not violated by district courts reliance on his prior convictions for purposes of sentencing under the armed career criminal act
D: holding that the armed career criminal designation based on prior convictions does not violate the sixth amendment under booker
D.