HierarchyRequestError in CSS

The violation of which of these CSS restrictions results in the error shown below?

HierarchyRequestError

Options
  1. Insertion of rule at index 0
  2. Index> CSSRuleList.length
  3. Insertion of an @import at-rule after a style rule
  4. Both Choice 1 and 2
  5. Both Choice 1 and 3

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