Correct Answer: C
Comprehensive and Detailed In-Depth Explanation:During a NIOS software upgrade (Grid > Upgrade), the Grid enters a sensitive state where certain actions risk instability. Let's evaluate:
* Upgrade Phases:Upload, Distribute, Test, Upgrade. Members reboot and sync, requiring database consistency.
* Options:
* A:Updating DNS views modifies the database, which could conflict with the upgrade's database sync or cause service interruptions. Unsafe.
* B:Changing DHCP properties (e.g., ranges) alters live configurations, risking lease sync issues during member reboots. Unsafe.
* C:Setting the time zone (Grid > Members > Edit > Basic) is a non-service-affecting change, stored locally and applied post-reboot. Safe during upgrades, as it doesn't impact DNS/DHCP
/Grid data. Correct.
* D:Incorrect, as C is a viable safe action.
* Practical Example:In an INE lab, you'd adjust a member's time zone during an upgrade to align logs, troubleshooting without disrupting the process.References:Infoblox NIOS Administrator Guide - Upgrade Best Practices; INE Course Content: NIOS DDI Grid Deployment.