Confused about WAN DNS server settings

I have wondered about this for a long time and its still true with firmware 8.1.1 RC2. In the WAN connection settings, there is a section for DNS servers. We can chose either “Obtain DNS server address automatically” or “Use the following DNS server addresses”. Fine.

But what does it mean if BOTH options are checked? Thanks.

It will be like this. So, the WAN will send DNS lookup to the 3 DNS servers.

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Thank you. Now that you say that, its clear these are checkboxes not radio buttons. I just assumed it must be one -or- the other. My mistake.