Discussion
Which component supports the junction between two shaft sections?
Answer: B
A sealed ball bearing in a rubber carrier bolted to the underbody supports the shaft while isolating vibration and permitting small movements. Perished rubber is a common source of vibration and noise. The bearing itself is sealed for life. Naming what changes and what stays the same is the reliable route through questions of this shape. The shared behaviour explains why these belong together and the differences explain why both exist. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.
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