Galen,
the litteral phrasing of the question:
... following primary server operating system(s) do you anticipate running ...
allows for interpreting the "you" in the singular.
I chose to do so, and also to put emphasis on the word "server", which in my case lead to the sole choice of OpenVMS.
Proost.
Have one on me.
Jan
Don't rust yours pelled jacker to fine doll missed aches.