Scenario : a Citrix Administrator Is in the Process of Migrating

Scenario : A Citrix Administrator is in the process of migrating the existing 7.15 LTSR Virtual Delivery Agent (VDA) machines used on premises to Citrix Cloud. The administrator has created a new manual machine catalog and Delivery Group in Citrix Cloud and pointed to the existing Device Collection in Citrix Provisioning. The administrator also restarted the VDA machines. What could prevent the VDA machines from registering in Citrix Cloud?

A) The VDA master image was NOT updated to communicate with the Cloud Connectors.
B) One of the two Cloud Connectors is down and unresponsive.
C) The Citrix policies have NOT been migrated to Citrix Cloud.
D) The VDA on the master image has NOT been updated to a later version.