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Let $h(t)$ be the impulse response of a linear time invariant system. Then the response of the system for any input $u(t)$ is

- $\int_{0}^{t} h(\tau) u(t-\tau) d \tau$
- $\frac{d}{d t} \int_{0}^{t} h(\tau) u(t-\tau) d \tau$
- $\left[\int_{0}^{t} h(\tau) u(t-\tau) d \tau\right]$
- $\int_{0}^{t} h^{2}(\tau) u(t-\tau) d \tau$