If a and b are the roots of equation x2 + px + 1 = 0andc, d are the roots of equation x2 + qx + 1 = 0, then the value of E = (a - c)(b - c)(a + d)(b + d) is
A
p2−q2
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B
q2−p2
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C
q2+p2
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D
None of these
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