Depends on the user license. If you use the Chatter Free license, the role is grayed out. (The field still shows as required, so I get what you mean, but the question asks what's required to create a user and Role isn't 'required' in all instances. I'm voting for ABC too)
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Dinataman
Highly Voted 4 years, 11 months agopicho707
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4 years, 3 months agoJon_C
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4 years, 7 months ago