Which statement about Avaya Tier 2/Business Partners is true?

A. They immediately escalate to Tier 3 as issue is encountered.
B. They describe the problem to Tier 3 in an escalation ticket and Tier 3 isolates and resolves the issue.
C. They isolate issue, resolve issue then escalate to Tier 3 for corrective action.

D. They isolate the issue, and if no root cause is found, escalate to Tier 3 to resolve the issue.