Which of the following statements is true?
a. A bullet can be individualized to a weapon by the number and twist of its lands and grooves.
b. The comparison microscope is an indispensable tool of the firearm examiner.
c. The diameter of the bore of a rifled firearm is its gauge.
d. Carbonaceous smoke or soot deposited around a bullet hole is normally indicative of a discharge 18 feet or less from the target.
Answer: b
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