Question of what is better, or what's right or wrong...

Should we add a sitemap to the main domain, with the sub domain urls listed within? Or have 2 separate sitemaps for each the main domain and the sub domain?

Example:

A: Have a sitemap.txt located in mydomain.com that lists the URLs in mydomain.com and staff.mydomain.com

OR

B: Have a sitemap.txt located in both mydomain.com and staff.mydomain.com, each listing the URLs within that directory.

Any feedback appreciated!

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Idaho Falls SEO