C works but is not the correct one, as it matches more than it should. notabaddomain.xyz would also match there since you dont request for a period . before the beggining of the text.
A is the correct option.
A. .*.baddomain.xyz|baddomain.xyz
This syntax ensures that all subdomains of baddomain.xyz (e.g., sub.baddomain.xyz) as well as the domain itself (baddomain.xyz) are covered. The .*\. part before the domain captures any subdomain, while baddomain\.xyz matches the domain itself. The pipe (|) acts as an OR operator
Disagree with Brian. C is not specific enough and would match things like notabaddomain.xyz and baddomain.xyz.com
A is the best solution for specifically looking for subdomains of baddomain.xyz or just the domain itself which is what the question asked for.
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