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What does ADS indicate in 8250 UART?

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What does ADS indicate in 8250 UART?

(a) address signal

(b) address terminal signal

(c) address strobe signal

(d) address generating signal

The question was asked during an interview for a job.

Enquiry is from UART in section Basic Peripherals of Embedded Systems

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The correct answer is (c) address strobe signal

The best I can explain: The ADS is address strobe signal and is working as active low in 8250 UART. The ADS signal is used to latch the address and chip select signals while processor access.

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