What is the most appropriate action for Allison to take with the accounts of summer interns who have left?

Disabling the accounts of summer interns who have left is the most appropriate action because it preserves the account data while preventing unauthorized access. By disabling the accounts, Allison ensures that any sensitive information or resources that the interns had access to remain secure, while also allowing for easy reactivation if the need arises in the future, such as for returning interns.

On the other hand, deleting the accounts would remove all historical data and access permissions permanently, which could lead to complications if there is a need to review past activities or reinstate the interns in the future. Changing permission settings does not fully restrict access in the same way disabling does, and doing nothing poses a risk of unauthorized access to the accounts, leading to potential security breaches. Disabling accounts is an effective balance between security and data management when dealing with departed personnel.