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Are the rules in Xanathar's Guide to Everything in clarifications/in addition to the Core rules or are they Optional/Variants?

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Are the rules in Xanathar's Guide to Everything in clarifications/in addition to the Core rules or are they Optional/Variants?

The release of Xanathar's Guide to Everything includes additional rules for things under Chapter 2 Dungeon Master's Tools.

Are those rules official updates/clarifications to the Core Rules or are they considered Optional/Variants that you a DM can utilize?