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Which enforcement mechanism supports the standards?

  • A.In service conformity testing of vehicles in use
  • B.None, since the type approval test is conducted once and the vehicle is not examined again thereafter
  • C.Only inspection
  • D.Testing of vehicles drawn from the fleet in service, to confirm that the approved performance is being maintained

Answer: A

In service conformity testing checks vehicles actually in use. The last option explains exactly that purpose, which makes it a correct and more detailed version of the same answer. 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. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.

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