Which product in the Cisco Spark Flex Plan offers advanced multimodal firewall traversal for mobile and remote access to unified communications services?

Which product in the Cisco Spark Flex Plan offers advanced multimodal firewall traversal for mobile and remote access to unified communications services?
A . Cisco Meeting Server
B . Cisco Unified Communications Server
C . Cisco Expressway Series Servers
D . Cisco Unified Connection Server

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Answer: C