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If $G(f)$ represents the Fourier transform of a signal $g$ (t) which is real and odd symmetric in time, then

1. $\mathrm{G}(f)$ is complex
2. $G(f)$ is imaginary
3. $\mathrm{G}(f)$ is real
4. $\mathrm{G}(f)$ is real and non-negative.