Explanation:
As per the given figure,
f(1) = 2, f(−1) = 1
∴ (1), (2) and (3) cannot be correct choices.
f(1) = 2f(−1)
i.e., 3 f(1) = 6 f(−1)
∴ 3f(x) = 6 f(−x)
Hence, option (d).
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