In the following, pick out the non-linear systems— (i)d3y(t)+

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In the following, pick out the non-linear systems—
(i) d³y(t) + t³ d²y(t) + t dy(t) + y² = 20ωt
dt³ dt² dt

(ii) d²y(t) + 1 dy + y = 4
dt² s dt

(iii) d²y(t) ² + dy + y(t) = 5
dt² dt

1. (i) and (iii)
2. (ii) and (iii)
3. (i) and (ii)
4. None of these

Correct Option: A

For more detail refer signals and systems synopsis.