Where will a surveillance mirror be installed inside the bus?

1. AIn the front part, in such a way that the driver can see all the passengers in the bus.
2. BIn the central part, in such a way that the driver can see all the passengers in the bus.
3. CThere is no need for a surveillance mirror; there are enough mirrors in the bus.
4. DIn the rear part, in such a way that the driver can see all the passengers in the bus.

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