Using the mapping principle, a function will be recognized if an input gives rise to one output. However, the mapping in option D has an input with two different output values. Hence, it does not represent a function.
- The input values, x will only give rise to an output for us to establish a mapping diagram as a function.
- When a single input gives rise to multiple output, then it does not represent a function.
Hence, the correct option is D.
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