Consider a linear time-invariant system whose input $r(t)$ and output $y(t)$ are related by the following differential equation:

$$\frac{d^{2}y(t)}{dt^{2}}+4y(t)=6r(t)$$

The poles of this system are at

1. $+2j, -2j$
2. $+2,-2$
3. $+4,-4$
4. $+4j,-4j$
in Others
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