Correct Answer: A, B, CIn order for Dave to set a particular security level on an issue in the Legal project, he must first be assigned to that particular security level to ensure he has the appropriate clearance. He also needs the Set Issue Security permission in the Legal project to execute the action. Lastly, Dave must have access to the Legal project itself to interact with its issues. The prerequisites of being a project administrator or having a Jira Software license are not necessarily required for setting an issue's security level. Additionally, the question states that security levels have already been configured, implying that issue-level security is already globally enabled.