In $△DEF$, the measure of angle $E$ is $90^{\circ }$. If $\cos D=\frac{5}{13}$ and $DE=1\text{cm}$, then what is the length (in $\text{cm}$) of side $EF$?

1. A
   2.6
2. B
   2.4
3. C
   1.5
4. D
   2