Which of the following statement (s) is/are correct? (i) \[xy=b,\] is a polynomial (ii) \[\frac{1}{{{x}^{3}}}+\frac{1}{{{y}^{3}}}\] is polynomial. (iii) \[\frac{{{a}^{3}}-3ab}{{{b}^{3}}}\]is a polynomial (iv) \[\frac{{{a}^{3}}-3a}{{{b}^{3}}}\] is a polynomial

• A. (i) and (iv)
• B. (ii) and (iii)
• C. (i) and (iii)
• D. (iii) and (iv)