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In the following figure the minimum value of the constant ' $C$ ', which is to be added to $y_{1}(t)$ such that $y_{1}(t)$ and $y_{2}(t)$ are different, is

1. $\Delta$
2. $\frac{\Delta}{2}$
3. $\frac{\Delta^{2}}{12}$
4. $\frac{\Delta}{\mathrm{L}}$