Let \( x_{1}, x_{2}, x_{3}, x_{4} \) be the roots (real or complex) of the equation \( x^{4}+a x....

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Let \( x_{1}, x_{2}, x_{3}, x_{4} \) be the roots (real or complex) of the equation \( x^{4}+a x^{3}+b x^{2}+c x+d=0 \). If \( x_{1}+x_{2}=x_{3}+x_{4} \) and
\( \mathrm{P} \)
\( a, b, c, d \in R \), then
W
If \( a=2 \), then the value of \( b-\mathrm{c} \) is
(1) -1
(2) 1
(3) -2
(4) 2


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