Consider the following systems:

Which of these systems can be modelled by the differential equation of form
\[
a_{2} \frac{d^{2} y(t)}{d t^{2}}+a_{1} \frac{d y(t)}{d t}+a_{0} y(t)=x(t)
\]
(a) 1 and 2
(b) 1 and 3
(c) 2 and 4
(d) 1, 2 and 4

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