Incorrect. Though the Per-App-VPN apps and configuration is used you do not need a tunnel or even an active UAG for this to be used for Mobile SSO. What is being leveraged here is the network traffic rules to redirect the flow to a cert proxy.
So A is the correct answer, no VPN and no end user need to enter credentials.
(https://docs.vmware.com/en/VMware-Workspace-ONE/services/WS1_android_sso_config/GUID-556493E9-F7F5-4C6F-BA96-31131284BB9A.html)
I really think its D. Even in your own reference, it mentioned that some apps may require VPN and some don't. Mobile SSO provides a way to use certificates to authenticate to those apps and connect to them using per-app VPN, if needed. Certainly, this is a poorly worded question, and open to way too much interpretation, however.
Changing my answer on this one to A. While Per-App VPN IS a corporate VPN, I think the idea here is that it is not a full-fledged VPN solution, like Cisco AnyConnect.
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