For $\mathrm{A}\stackrel{\mathrm{k}{}_1}{\to }\mathrm{B}\stackrel{\mathrm{k}{}_2}{\to }\mathrm{C}$ with $k_1=0.10\mathrm{mi}{\mathrm{n}}^{-1}$, $k_2=0.50\mathrm{mi}{\mathrm{n}}^{-1}$ and only A present initially, select the correct statement(s). Use $\ln 5=1.609$.

1. AThe maximum value of $[\mathrm{B}]$ is $0.20[\mathrm{A}{]}_0$.
2. B$[\mathrm{B}]$ is maximum at $t=4.02$ min.
3. CThe initial rate of formation of C is zero.
4. DAt the time of maximum $[\mathrm{B}]$, $[\mathrm{B}]=0.2[\mathrm{A}]$.