If a Grid Master Fails, what can be promoted to take the place of the...

Comprehensive and Detailed In-Depth Explanation:Grid Master (GM) failure recovery:

B:A Grid Master Candidate (GMC), pre-designated in Grid Manager (Grid > Members), can be promoted (Grid > Promote GMC) to replace a failed GM, assuming its role. Correct.

A:Grid Manager is the UI, not a device. Incorrect.

C:Not all members are GMCs—only designated ones qualify. Incorrect.

D:No “standby GM” role—GMC is the term. Incorrect.

Practical Example:In an INE lab, promote a GMC after GM failure, test sync, and troubleshoot promotion issues.References:Infoblox NIOS Administrator Guide – Grid Master Promotion; INE Course Content: NIOS DDI Grid Troubleshooting.