Suppose (x₁, x₂) are uniformly distributed on the unit square, i.e., f(x₁, x₂) = 1, 0 < x₁ < 1, 0 < x₂ < 1. Find the distribution of y = x₁ x x₂ by finding the CDF of y.
a. y = x₁ + x₂
b. y = x₁ - x₂
c. y = x₁ x x₂
d. y = x₁ / x₂