What are two reasons why port 8443 is unreachable from the Internet to the Expressway-E?

What are two reasons why port 8443 is unreachable from the Internet to the Expressway-E? (Choose two.)
A. The MRA license is missing on the Expressway-E.
B. The Unified Communications zone is down.
C. Transform is not configured on Expressway-E.
D. The SRV record for _cisco-uds is misconfigured.
E. The firewall is blocking the port.