Final answer:
Baselines are used to group VMs and baseline groups are used to organize a set of baselines.
Step-by-step explanation:
The correct comments in regards to baseline and baseline groups in VUM are:
- Baselines are used to group VMs.
- Baseline groups can be used to organize a set of baselines.
Option C is incorrect because baselines are not used to group ESXi hosts, and Option D is incorrect because baseline groups are not used to group application servers.