It seems you mixed up questions and answers. The question actually is:
Which of these scenarios is a suitable candidate for autoscaling?
And the three answer choices are:
The number of users requiring access to an application varies according to a regular schedule. For example, more users use the system on a Friday than other days of the week.
The system is subject to a sudden influx of requests that grinds your system to a halt. The workload increases exponentially and there appears to be no reason for this surge of activity.
- Your organization is running a promotion and expects to see increased traffic to their web site for the next couple of weeks. You base your autoscaling strategy on counters that measure business processes.
The question is poorly worded, because, both first and the third answer choices can be viewed as correct. The distinction between them is based on the information provided in https://learn.microsoft.com/en-us/training/modules/autoscale-java-azure/4-rules , namely
- Metric-based rules
- Schedule-based rules
The first answer choice is more suitable for schedule-based rules, while the third answer choice should be based on metrics.
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hth
Marcin