Which of the following statements is/are correct? (i) A rational number is said to be positive if its numerator and denominator are either both positive integers and both negative integers. (ii) In the number line for integers, every number on the right is greater than all the number on its left and vice-versa. (iii) Associative property holds both in addition and in subtraction.

• A. (i) only
• B. Either (i) and (iii) or (ii)
• C. (i), (ii) and (iii)
• D. (i) and (ii)