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The ABCD parameters of an ideal $n: 1$ transformer shown in the figure are $\left[\begin{array}{ll}n & 0 \\ 0 & \mathrm{X}\end{array}\right]$. The value of $X$ will be

1. $n$
2. $\frac{1}{n}$
3. $n^{2}$
4. $\frac{1}{n^{2}}$