Technician A is right about knee bolster, Technician B is correct about knee airbag. Both are correct.
Technician A is correct. A knee bolster is indeed used to protect the knees of rear occupants in a vehicle to enhance safety during a crash.
On the other hand, Technician B is also correct. A knee airbag serves to help prevent occupants from sliding under the dash by providing additional protection during a collision.
Therefore, both Technician A and Technician B are right in their statements.
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