What is a good way for a Scrum Team to ensure that security concerns are addressed and transparent?

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What is a good way for a Scrum Team to ensure that security concerns are addressed and transparent?

A. Add Security Sprints to resolve security concerns when needed.
B. Have the Scrum Team create Product Backlog items for each concern and/or add security concerns to the definition of ג€Doneג€.
C. Create a separate backlog for security items and only work on the items when a specialist becomes available.
D. Delegate the work to an external team.