By a change of variable x(u, y) = uv, y(u, v) = v/u is double

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By a change of variable x(u, y) = uv, y(u, v) = v/u is double integral, the integrand f(x, y) changes to f(uv, v/u) φ (u, v). Then, φ(u, v) is

1. 2 v / u
2. 2 uv
3. v²
4. 1

Correct Option: A