What ROI can HP claim with HP ProLiant Gen8 servers?

A.
3 months
B.
5 months
C.
12 months
D.
13 months
Explanation:
http://h41112.www4.hp.com/campaigns/O-KIJ84_EG_Substantiation_INTEL_ENUS.pdf(page 1, see claim: ROI in only three short months, last sentence)