a. uses air temperature and the presence of off-gassing to determine whether a scene is safe to enter.
b. takes a sample of air and identifies the approximate quantities of explosive material in the sample.
c. takes a sample of air and identifies the quality of the smoke and what type of igniter was used to set the fire.
d. uses gun powder to fire a jet of water or a projectile at a particular component of an explosive to make it safe.
ANSWER: B