If x varies as y, then which of the following is/are correct?1. x2 + y2 varies as x2 - y22. \(\frac{x}{y^2}\) varies inversely as y3. \(\sqrt[n]{x^2y}\) varies as \(\sqrt[2n]{x^4y^2}\)Select the correct answer using the code given below:

• A. 1 and 2 only
• B. 2 and 3 only
• C. 3 only
• D. 1, 2 and 3