A is correct.
Stretched clusters consist of two active data sites and one witness site. Each site is its own fault domain supporting a fault tolerance of 1 across the active data sites.
A stretched cluster can have up to 15 hosts at each site and must be in communication with a witness host, which brings the host maximum to 15 + 15 + 1 witness.
Each site should contain the same number of hosts.
Taken from vSAN 6.7 Deploy and Manage Lecture Manual
Answer is A is correct. Please see the link & note below:
https://download3.vmware.com/vcat/vmw-vcloud-architecture-toolkit-spv1-webworks/index.html#page/Storage%20and%20Availability/Architecting%20VMware%20vSAN%206.2/Architecting%20Virtual%20SAN%206.2.2.101.html
Note:
With vSAN 6.2, stretched clusters have been enhanced to simplify the creation of the configuration. A new graphical configuration wizard assists with the configuration as appropriate. vSAN stretched clustering is a specific configuration implemented in environments where disaster/downtime avoidance is a key requirement. However, the maximum number of hosts in a stretch cluster configuration remains at 31, where Site 1 contains 15 hosts, Site 2 contains 15 hosts, and site 3 contains the witness host or virtual appliances
mistake
A maximum of thirty (30) hosts may be used in a single vSAN Stretched Cluster across the data sites. In vSAN versions up to 6.5, this was fifteen (15) per site. With the introduction of Site Affinity rules that places data on only one data site or the other, it is possible to have a vSAN Stretched Cluster deployment that does not have an equal number of hosts per site.
B
Have done a couple of 30+1 stretched deployments - 15 hosts per site as others have already stated.
Question doesn't state specifically the maximum nodes for 1 site, so for the entire solution, B is correct.
A
In vSAN Stretched Cluster maximum number of data hosts on each site is 15.
Limit: 30 (15 on each site x 2)
https://configmax.vmware.com/guest?vmwareproduct=vSphere&release=vSphere%206.7&categories=7-0
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