A customer called Avaya Support after their telecom administrator was unable to add 50 new telephones for new hires. Avaya support determined that the number of telephones exceeded the capacity the system could support.

Which pre-implementation step was omitted?

A. Accessing support.avaya.com to verify customer systems compatibility.
B. Testing all third-party equipment and software.
C. Verifying that the version installed is compatible with existing versions.

D. Providing accurate licensing specification.