Which of the following is the optimal temperature for a data center, per the guidelines established by the America Society of Heating, Refrigeration, and Air Conditioning Engineers (ASHRAE)?

A. 69.8-86.0degF (21-30degC)
B. 64.4-80.6degF(18-27degC)
C. 51.8-66.2degF(11-19degC)
D. 44.6-60-8degF(7-16degC)