Which of the following facts are correct about a polygon? (i) The number of sides of the polygon is 8 if the sum of interior angles is \[1080{}^\circ \]. (ii) The sum of all interior angles of a Heptagon is \[720{}^\circ \]. (iii) The sum of all exterior angles of a decagon is \[540{}^\circ \]. (iv) The ratio of the measure of an angle of regular octagon to the measure of its exterior angle is 3:1.

• A.  Only (i), (ii) and (iii)   
• B.  Only (ii), (iii) and (iv)
• C.  Only (i), (ii) and (iv)    
• D.  All of these