A Scrum Team has requested a hardening Sprint to integrate the work produced in previous Sprints and test before releasi

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A Scrum Team has requested a hardening Sprint to integrate the work produced in previous Sprints and test before releasing.
What three scenarios has likely occurred? (Choose three.)

A. The team's Definition of Done is not being adhered to during every Sprint.
B. The team's Definition of Done is weak or incomplete causing a build up of technical debt.
C. The Development Team is having difficulties with the ability to regularly release during a Sprint.
D. Hardening Sprints are supported by the Scrum framework so this is acceptable.
E. Scrum has been customized in a suitable manner to make the previous work releasable.