Which intervention will best establish a military personnel's mental health fitness for deployment ...

Which intervention will best establish a military personnel's mental health fitness for deployment to a war zone?
 
  a. Conducting a predeployment mental health screening as part of the general physical examination
  b. Reviewing the military performance records prior to deployment for identification of possible risk factors
  c. Providing each military personnel with the opportunity to confidentially discuss their individual concerns with a mental health professional
  d. Asking the military personnel to identify in writing any history of mental illness including depression, anxiety, or substance dependency issues