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If x varies as y, then which of the foll...

If x varies as y, then which of the following is/are correct?
1. `x^2 + y^2` varies as `x^2 - y^2`
2. `x/(y^2)` varies inversely as y
3. `root(n)(x^2y)` varies as `root(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

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