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Choose the correct answer from the given four options.The differential equation for which $\text{y}=\text{a}\cos\text{x}+\text{b}\sin\text{x}$ is a solution, is:

1. $\frac{\text{d}^2\text{y}}{\text{d}\text{x}^2}+\text{y}=0$
2. $\frac{\text{d}^2\text{y}}{\text{d}\text{x}^2}-\text{y}=0$
3. $\frac{\text{d}^2\text{y}}{\text{d}\text{x}^2}+(\text{a}+\text{b})\text{y}=0$
4. $\frac{\text{d}^2\text{y}}{\text{d}\text{x}^2}+(\text{a}-\text{b})\text{y}=0$