When You Deploy Cisco Unified CCE on Cisco UCS C-Series

When you deploy Cisco Unified CCE on Cisco UCS C-Series Servers, which statement about the connectivity of the upstream switches is true?

A) You can connect the Cisco UCS C-Series Servers to stacked Layer 2 switches (having multiple Layer 2 switches for HA but in a stackable configuration) .
B) You can connect to two or more Layer 2 upstream switches.
C) You can connect to only one Layer 2 upstream switch per Cisco UCS C-Series Server.
D) Cisco UCS C-Series Server does not support Layer 2 upstream switches.