$1.$ A computer supports three I$/$O techniques: programmed I$/$O$,$ interrupt$-$driven I$/$O and DMA.

a$.$ The programmed I$/$O does not incur any extra overhead to access data in device A$,$ if the device is available. If the device is unavailable, the CPU has to keeping polling the device, until it is available.

b$.$ The interrupt$-$driven I$/$O incurs $0\mathrm{.}5$ms overhead for each interrupt service.

c$.$ The DMA incurs $10$ms overhead each time it is configured.

Suppose a program needs to access $10$MB data in device A in total, each time access $1$MB$.$ The device is available every $4$ms$.$

If we do not consider the time for the program to access the data in device A$,$ its pure execution time is $100$ms$.$

The time to transfer $1$KB data between the CPU and the device is $0\mathrm{.}001$ms$.$ The time to transfer $1$KB data between device and the memory is $0\mathrm{.}0012$ms$,$ and the time to transfer $1$KB data between CPU and the memory is $0\mathrm{.}0008$ms$.$ To access the $10$MB data, the DMA only needs to be configured once.

Which technique is the best for this program?