Which Google StackDriver features should they use?

For this question, refer to the Dress4Win case study.

As part of Dress4Win’s plans to migrate to the cloud, they want to be able to set up a managed logging and monitoring system so they can handle spikes in their traffic load. They want to ensure that:

• The infrastructure can be notified when it needs to scale up and down to handle the ebb and flow of usage throughout the day

• Their administrators are notified automatically when their application reports errors.

• They can filter their aggregated logs down in order to debug one piece of the application across many hosts

Which Google StackDriver features should they use?
A . Logging, Alerts, Insights, Debug
B . Monitoring, Trace, Debug, Logging
C . Monitoring, Logging, Alerts, Error Reporting
D . Monitoring, Logging, Debug, Error Report