You are required to write a paper on the “treatment of depression”. Which search strategy would find the smallest number of documents?

Depression AND psychotherapy NOT antidepressants.  

Depression OR psychotherapy OR antidepressants.  

Depression OR psychotherapy AND antidepressants.  

Depression AND psychotherapy AND antidepressants.  

Depression AND psychotherapy NOT antidepressants.  

The search strategy that would find the smallest number of documents is: "Depression AND psychotherapy NOT antidepressants."