Legal disclaimer: The NDA you signed digitally before starting the VMCE exam at Pearson VUE, prohibits you from discussing any part of the VMCE exam contents. Pending further review, this exact exam question is now disabled.
As it was stated above, the specific feature "Backup from Storage Snapshots" is only available for VMware as per https://www.veeam.com/backup-version-standard-enterprise-editions-comparison.html
The license for Hyper-V and vSphere are indeed not the same. If you purchased a license to protect a Hyper-V environment and decide to replace everything with vSphere, you would have to obtain a new .lic file, that instead of Hyper-V licenses includes vSphere licenses.
Principal Technologist, Global Education Services @ Veeam Software
Veeam Certified Architect #1 | Veeam Certified Trainer #4 [v7,v8,v9] | Veeam Certified Trainer Mentor #1