Which of the codes given below contains only the correct statements?

Statements:

(i) Venn diagram is a clear method of notation.

(ii) Venn diagram is the most direct method of testing the validity of categorical syllogisms.

(iii) In Venn diagram method the premises and the conclusion of a categorical syllogism is diagrammed.

(iv) In Venn diagram method the three overlapping circles are drawn for testing a categorical syllogism.

Codes: