Venn diagram - choose the odd man out

Question

  Which one of the following statements is not correct in the context of venn 
 diagram method ?

 (1) It can be used to represent classes as well as propositions
 (2) It is a method of testing the validity of arguments
 (3) It represents both the premises of a syllogism in one diagram
 (4) It requires two overlapping circles for the two premises of a standard- 
 form categorical syllogism.

Answer 1

I think it is 4 that is not correct. Consider the following diagram.

It represents both premises that "no IT applications are IT operations" and that "no IT operations are IT applications"... but the circles are not overlapping, which (4) states is a necessity.