A Nurse Is Working at a Suicide Prevention Hotline and Is

A nurse is working at a suicide prevention hotline and is training new staff members. He or she informs the new nurses that the most important questions to ask callers include:

A) Whether they have a means or a plan to commit suicide, including whether they have access to a weapon, such as a gun.
B) If they have been diagnosed with a mental illness.
C) If they suffer from addiction substance use disorder.
D) None of the above.