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Let \( \mathrm{f}(\mathrm{x})=\mathrm{x}^{2}-2 \mathrm{x}-1 \forall \mathrm{x} \in \mathrm{R} \). Let \( \mathrm{f}:(-\infty, \mathrm{a}] \rightarrow[\mathrm{b}, \infty) \), where 'a' is the largest real number for which \( \mathrm{f}(\mathrm{x}) \) is bijective.
\( \mathrm{P} \)
The value of \( (\mathrm{a}+\mathrm{b}) \) is equal to
(A) \( -2 \)
(B) \( -1 \)
(C) 0
(D) 1
\( \mathrm{W} \)
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