B. You must reboot the device.
When upgrading the Junos software on a device, it is necessary to reboot the device after the upgrade process. This allows the new software version to take effect and ensures that the device runs on the upgraded software.
Option A, creating a user account named maintenance-user, is not a required step for a software upgrade. It may be a recommended practice to have a dedicated maintenance user account, but it is not a mandatory step for the upgrade process.
Option C, loading the factory default configuration, is also not a required step for a software upgrade. The existing configuration can be preserved during the upgrade process, and it is not necessary to load the factory default configuration.
Option D, zeroizing the device, is a drastic step that erases all configuration and resets the device to its factory state. It is not a required step for a software upgrade unless there are specific circumstances that require a complete reset.
So, the correct answer is B. You must reboot the device.
B is ok:
"To activate the new software, you must reboot the system. You can perform the system reboot as a separate step or you can initiate it by adding the reboot option at the end of the request system software add command. "
https://douran.academy/wp-content/uploads/ebooks/jnica-junos-study-guide-part1.pdf
Page: 81
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