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Which of the following functions is/are continuous on the imaginary axis?
\dfrac{z+1}{z^2+5z+6}
\dfrac{1}{z^2+z+1}
\dfrac{1}{z^2+1}
\dfrac{z^2-2z+1}{z^2-3z-4}
\dfrac{z^{2025}}{1-i}
\dfrac{1}{iz^2+4z-4i}
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