With the following equations, the time-invariant systems are\(1. \frac{d^2 y(t)}{dt^2 }+2t \frac{dy(t)}{dt}+5y(t)=x(t)\)2. y(t) = e-2x(t)3. \( y(t)= [\frac{d x(t)}{dt}]^2\)4. \(y(t)=\frac{d}{dt} [e^{-2t}x(t)]\)

• A. 1 and 2
• B. 1 and 4
• C. 2 and 3
• D. 3 and 4