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\( \operatorname{Limit}_{n \rightarrow \infty} \frac{-3 n+(-1)^{n}}{4 n-(-1)^{n}} \) is
P
W
(a) \( -\frac{3}{4} \)
(b) \( -\frac{3}{4} \) if \( \mathrm{n} \) is even; \( \frac{3}{4} \) if \( \mathrm{n} \) is odd
(c) not exist if \( \mathrm{n} \) is even ; \( -\frac{3}{4} \) if \( \mathrm{n} \) is odd
(d) \( +1 \) if \( \mathrm{n} \) is even ; does not exist if \( \mathrm{n} \) is odd
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