A. 1000×(P/A,8%,4)×(P/F,8%,3) B. 1000×[(P/A,8%,8)-(P/A,8%,4)] C. 1000×[(P/A,8%,7)-(P/A,8%,3)] D. 1000×(F/A,8%,4)×(P/F,8%,7)