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The statistics of runs scored in a series by four batsmen are provided in the following table. Who is the most consistent batsman of these four?

$$\begin{array}{|c|c|c|}  \hline \text{Batsman} & \text{Average} & \text{Standard Deviation} \\ \hline K & 31.2 & 5.21 \\  \hline L & 46.0 & 6.35 \\ \hline M & 54.4 & 6.22 \\ \hline N & 17.9 & 5.90 \\ \hline \end{array}$$

  1. $K$
  2. $L$
  3. $M$
  4. $N$
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