Answer the following by appropriately matching the lists based on the information given in the paragraph. A musical instrument is made using four different metal strings, 1,2,3 and 4 with mass per unit length $\mu, 2 \mu, 3 \mu$ and $4 \mu$ respectively. The instrument is played by vibrating the strings by varying the free length in between the range $\mathrm{L}_0$ and $2 \mathrm{~L}_0$. It is found that in string-1 $(\mu)$ at free length $\mathrm{L}_0$ and tension $\mathrm{T}_0$ the fundamental mode frequency is $\mathrm{f}_0$. List-I gives the above four strings while list-II lists the magnitude of some quantity.

If the tension in each string is $T_0$, the correct match for the highest fundamental frequency in $f_0$ units will be,