You work as a design specialist at Certkiller .com. Certkiller .com uses SAN Copy from their production system (PRD) to both Quality Assurance and Test (QAT) and Development (DEV) instances. The PRD instance resides on DMX while both QAT and DEV instances reside on CLARiiON ATA.
The PRD instance is 27 TB and is backed up from BCVs. Backups from SnapView support both QAT and DEV instances. The QAT instance is refreshed monthly but the DEV instance is refreshed quarterly because it is a time consuming process. Certkiller .com plans to upgrade the system. You need to run upgrade tests.

What is the primary risk to the QAT instance during upgrade tests?

A.
Insufficient SNAP region.

B.
Insufficient BCV capacity.

C.
PRD configuration change.

D.
Inconsistent upgrade time calculation.