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In the graph below, the concentration of a particular pollutant in a lake is plotted over (alternate) days of a month in winter (average temperature $10^{\circ} C$) and a month in summer (average temperature $30^{\circ} C$).

Consider the following statements based on the data shown above:

i. Over the given months, the difference between the maximum and the minimum pollutant concentrations is the same in both winter and summer

ii. There are atleast four days in the summer month such that the pollutant concentrations on those days are within $1$ ppm of the pollutant concentrations on the corresponding days in the winter month.

Which one of the following options is correct?

  1. Only i
  2. Only ii
  3. Both i and ii
  4. Neither i nor ii
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