The ATF ?? s Bomb Data Center maintains a _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

The ATF$\mathrm{â??}$s Bomb Data Center maintains a $\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$ to assist police in tracking explosives from manufacturer to purchaser or possessor to identify crimes and suspects.

A$.$ dog sniffing unit

B$.$ command post at $\mathrm{100}-$mile intervals along all U$.$S$.$ borders

C$.$ National Explosives Tracing Center

D$.$ precinct within the FBI office