How did Forrester and Ovum rate the HP private cloud solutions in 2013?
A. Both Forrester and Ovum rated HP at the second tier.
B. Forrester rated HP as a leader, and Ovum rated HP as a challenger (second tier).
C. Forrester rated HP as a strong performer (second tier), and Ovum rated HP as a leader.
D. Both Forrester and Ovum rated HP as a leader (first tier).