The spring constants of four springs are determined by plotting the following graphs of force F against extension x.
Which order of the graphs shows decreasing spring constants?

1 )
$2 \to 1 \to 3 \to 4$
$3 \to 4 \to 2 \to 1$
3 )
$4 \to 2 \to 1 \to 3$
4 )
$4 \to 3 \to 2 \to 1$
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