Button group in Bootstrap 4

A button group in a component element of Bootstrap 4 has a z index of 2.

In the given context, which of these statements would be valid?

Options
  1. The button group is in default state as per z index standard
  2. The button group is in :hover state as per z index standard
  3. The button group is in .active state as per z index standard
  4. The button group is in .focus state as per z index standard

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