If \(p=\frac{a^2}{(b-a)(c-a)}\), \(q=\frac{b^2}{(c-b)(a-b)}\), \(r=\frac{c^2}{(a-c)(b-c)}\), then what is (p + q + r)2 equal to?

1
9
2
4
3
1
4
0

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