Technician A is correct about the cold knife being pneumatic, and Technician B is also right regarding wire tools for removing trim.
Technician A is right when he says a cold knife is pneumatic because the cold pack in the picture (b) contains ammonium nitrate which is used in cold packs. Technician B is also correct as a wire tool can be used for removing some trim, which is a practical application of wire tools in various contexts.
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