Which element is a hardware feature of the Cisco ONS 15454 MSTP?

Which element is a hardware feature of the Cisco ONS 15454 MSTP?

A.
ESCON support on 2.5 Gbps data muxponder cards

B.
L-band DWDM transport solution

C.
Metro 10-Gbps intercampus connectivity

D.
Network-level alarm correlation