The differential equation $\frac{dy}{dx}+4y=5$ is valid in the domain $0 \leq x \leq 1$ with $y(0)=2,25$. The solution of the differential equation is
1. $y=e^{-4x}+5$
2. $y=e^{-4x}+1.25$
3. $y=e^{4x}+5$
4. $y=e^{4x}+1.25$