What is a mandatory requirement for a vSAN stretched cluster?
A. Two witness hosts protected by vSphere Fault Tolerance
B. Minimum of two guaranteed lines of 10Gbps bandwidth
C. vSphere Replication configured between the data sites
D. Latency between data sites must be less than or equal to 5ms
I agreed with option D. I added an additional reference.
https://storagehub.vmware.com/t/vsan-stretched-cluster-guide/ (download the full PDF, page 33)