C.
Alternatively, you can select which Defenders to upgrade. Use this method when you have different maintenance windows for different deployments. For example, you might have an open window on Tuesday to upgrade thirty Defenders in your development environment, but no available window until Saturday to upgrade the remaining twenty Defenders in your production environment. In order to give you sufficient time to upgrade your environment, older versions of Defender can coexist with the latest version of Defender and the latest version of Console.
https://docs.paloaltonetworks.com/prisma/prisma-cloud/22-12/prisma-cloud-compute-edition-admin/upgrade/upgrade_defender_single_container