Three separate strings are made of the same material. String $1$ has length $L$ and tension $,$ string $2$ has length $2L$ and tension $2,$ and string $3$ has length $3L$ and tension $3.$ A pulse is started at one end of each string. If the pulses start at the same time, the order in which they reach the other end is

$2,3,1$

They all take the same time.

$3,1,2$

$3,2,1$

$1,2,3$