Which is the maximum acceptable site-to-site round-trip delay WAN/LAN requirement for Cisco Unified MeetingPlace deployments?

Which is the maximum acceptable site-to-site round-trip delay WAN/LAN requirement for Cisco Unified MeetingPlace deployments?

A.
1500 ms round trip

B.
150 ms round trip

C.
150 sec round trip

D.
There is no specific requirement