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Plot (A): Look for two visible peaks. A good or real pulsar candidate would have at least two visible peaks.

Plot (C): Similar to Plot (B), identify if two vertical stripes are visible. A genuine pulsar signal would show two vertical stripes. But, they shouldn't be curved.

Plot (D): Identify the shape of the curve. A genuine pulsar signal typically displays a smooth or distorted bell-shaped pattern.

The key criterion for a good pulsar candidate is that all four plots must meet the aforementioned criteria i.e. visible peaks in Plot (A), two visible vertical stripes in Plots (B) and (C), and a bell-shaped curve in Plot (D).