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Which of the following is the empty set
(a) \( \left\{x: x\right. \) is a real number and \( \left.x^{2}-1=0\right\} \)
\( \mathrm{P} \)
(b) \( \left\{x: x\right. \) is a real number and \( \left.x^{2}+1=0\right\} \)
W
(c) \( \left\{x: x\right. \) is a real number and \( \left.x^{2}-9=0\right\} \)
(d) \( \left\{x: x\right. \) is a real number and \( \left.x^{2}=x+2\right\} \)
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