Which of the following is a recommended safety intervention for a teenager admitted to the hospital for suicide ideation?

Allow the teenager to keep their personal belongings, including sharp objects, in their room.

Ensure continuous monitoring by assigning a mental health professional to check on the teenager every hour.

Implement a no-suicide contract with the teenager to guarantee they will not harm themselves.

Remove any items in the room that could be used for self-harm and provide continuous supervision.