Andre Fournier has had a preoccupation with fears of having a serious life-threatening disease. He has consulted many doctors over the past several years about this. According to Andre, there has been no evidence of any viable disease process going on for him and he states, "While all the docs tell me that I’m perfectly fine, I know they’re wrong. They just haven’t found my cancer yet". Andre’s preoccupation with his health is indicative of:.a) Obsessive compulsive disorderb) Illness anxiety disorderc) Anxiety disorder due to another medical conditiond) Generalized anxiety disorder