A Virtual Machine Scale Set runs several hundred instances. You want a scale-out action where a fixed increase would not noticeably improve performance, so each trigger should add instances relative to the current count. Which scale operation should the autoscale rule use?
- AIncrease count by, which adds a fixed number of virtual machines on each trigger.
- BIncrease count to, which creates instances up to a defined maximum amount.
- CIncrease percent by, which scales the instance count by a percentage each trigger. Correct
- DDecrease percent by, which removes a percentage of instances on each trigger.
Why A is wrong: Increase count by adds a fixed number, which the scenario explicitly rules out for a large scale set.
Why B is wrong: Increase count to creates as many instances as needed to reach a target maximum, not a relative growth per trigger.
Why C is correct: Correct. Increase percent by applies a percentage-based increase of virtual machines, which the documentation calls good for larger scale sets where a fixed increase may not noticeably improve performance.
Why D is wrong: Decrease percent by is a scale-in operation and reduces instances rather than scaling out.