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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