In the following pick out the time-invariant systems. (i)dy(t)

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In the following pick out the time-invariant systems.
(i) dy(t) + 5y(t) = u(t)
dt

(ii) t d²y(t) + dy(t) + 2y(t) = v(t)
dt² dt

(iii) d²y(t) + 5 dy(t) + 6y(t) = ω(t)
dt² dt

1. (i) and (iii)
2. (i) and (ii)
3. (ii) and (iii)
4. (i) only

Correct Option: A

NA