Quadratic variation of a scaled Itô integral

HardCalculus Stochastic Processes~5m

Let $X_t = \int_0^t s\,dW_s$ , a stochastic integral against standard Brownian motion with a time-varying integrand. What is the quadratic variation $[X]_3$ of $X$ over $[0,3]$ ? (to 3 decimals)

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For $X_t=\int_0^t \sigma_s\,dW_s$ , the quadratic variation is $\int_0^t \sigma_s^2\,ds$ .
Square the integrand $s$ first, then integrate: $\int_0^3 s^2\,ds$ .

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Quadratic variation of a scaled Itô integral

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