Which deployment option is invalid for Cisco Unified Contact Center Express v. 5.0?

A.
a two-node Contact Center Express cluster connected to a Communications Manager cluster

B.
two Contact Center Express clusters, each with two nodes, connected to the same Communications
Manager cluster

C.
a one-node Contact Center Express cluster connected to two Communication Manager clusters

D.
a one-node Contact Center Express cluster connected to a Communication Manager Express router

Explanation: