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A. (ii)
B. (iv)
C. (i)
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Which rules are functions?
D. (iii)
(i) f: ZR, f(x) = 1/(x² - 5)
(ii) f: ZZ, f(x) = 1/(x² - 5)
(iii) f: ZZ, f(x) = 1/(x² - 4)
(iv) f: ZR, f(x) = 1/(x² - 4)
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