GATE | CSE 2023 | Question 35

A keyboard connected to a computer is used at a rate of 1 keystroke per second. The computer system polls the keyboard every 10 ms (milliseconds) to check for a keystroke and consumes 100 μs (microseconds) for each poll. If it is determined after polling that a key has been pressed, the system consumes an additional 200 μs to process the keystroke. Let T1 denote the fraction of a second spent in polling and processing a keystroke.

In an alternative implementation,  the system uses interrupts instead of polling. An interrupt is raised for every keystroke. It takes a total of 1 ms for servicing an interrupt and processing a keystroke. Let T2 denote the fraction of a second spent in servicing the interrupt and processing a keystroke.
T1
The ratio T1/T2 is (Rounded off to one decimal place)

(A)

(B)

(C)

(D)