A is correct
Proxy agents collect data, such as virtual machine data, from the hypervisors.
https://docs.vmware.com/en/VMware-Validated-Design/5.0/com.vmware.vvd.sddc-design.doc/GUID-6158120D-C982-4F27-B1D3-4BCB46254FCF.html
Answer A
https://docs.vmware.com/en/vRealize-Automation/7.6/com.vmware.vra.install.upgrade.doc/GUID-D491FFB3-D195-4E98-979E-498119FB674A.html
The vRealize Automation IaaS Proxy Agent is a windows service used to communicate with specific infrastructure endpoints.
Could be vSphere, Hyper-V, XenServer, XenDesktop...
This link shows it is vSphere.
https://docs.vmware.com/en/VMware-Validated-Design/5.0/com.vmware.vvd.sddc-design.doc/GUID-6158120D-C982-4F27-B1D3-4BCB46254FCF.html
To provision and manage virtual machines, the proxy agent sends requests for resource virtualization to the hypervisor, that is, to vSphere.
The reference link states "The vRealize Automation IaaS Proxy Agent is a windows service used to communicate with specific infrastructure endpoints. In this design, the vSphere Proxy agent is utilized to communicate with vCenter." Did not mention anything about cloud endpoints, so not sure if C is correct.
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