A customer has a development environment with 50 connected Defenders. A maintenance window is set for Monday to upgrade 30 stand-alone Defenders in the development environment, but there is no maintenance window available until Sunday to upgrade the remaining 20 stand-alone Defenders. Which recommended action manages this situation?
A. Go to Manage > Defender > Manage, then click Defenders, and use the Scheduler to choose which Defenders will be automatically upgraded during the maintenance window
B. Find a maintenance window that is suitable to upgrade all stand-alone Defenders in the development environment
C. Upgrade a subset of the Defenders by clicking the individual Actions > Upgrade button in the row that corresponds to the Defender that should be upgraded during the maintenance window
D. Open a support case with Palo Alto Networks to arrange an automatic upgrade