How many Cisco Unified Communications Manager users can be processed by a Cisco UCS C210 M2 server compared to a Cisco MCS 7845-I3 server?

How many Cisco Unified Communications Manager users can be processed by a Cisco UCS C210 M2 server compared to a Cisco MCS 7845-I3 server?
A. single
B. double
C. triple
D. quadruple
E. quintuple
F. sextuple
G. octuple