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What is the speed of the 8250 UART?

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What is the speed of the 8250 UART?

(a) 4800bits/sec

(b) 1200bits/sec

(c) 12000bit/sec

(d) 9600bits/sec

The question was posed to me in an interview for job.

This intriguing question originated from UART Protocol topic in chapter Internet Principles of IOT

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Right choice is (d) 9600bits/sec

To explain: The 8250 UART has one character buffer for the receiver and the transmitter each, which meant that communications software performed poorly at speed above 9600bits/sec, especially it operating under a multitasking system or if handling interrupts from disk controllers.

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