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Data Transferrinf Over a 25 Meter Wire.

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I am designing a new Language laboratory System.
I want to send serial data via a Common bus to all Stations (Students devices).
The length of this bus is around 20-25 meters. Which method is the best
for transferring Data. I mean FSK, RJ485 (if I wrote it right), SPI (that I don't think it work) or ...
The Baude Rate is Around 9600 bps

ThanX in advance

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Thank you very much for your reply.

Master Should send Data to all slaves and Retrieve some data from each Slave.
Just like a I2C Bus System.
But the difference with this system and a Small I2C Bus System is Distance between Master and Slaves.

BTW, Each Slave is a MCU Based Circuit.

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