A $4-$bit binary$-$weighted$-$input digital$-$toanalog $($DAC$)$ converter has a reference of $5$ Volts as logical input value, and with an output range $0$ to $-7\mathrm{.}5$ Volts. A reasonable resistor combination for the input resistor $($R$)$ and the feedback resistor $($R$\_$feedback$)$ is:

a$.2$ KOhms, $1\mathrm{.}5652$ KOhms

b$.2$ KOhms, $1\mathrm{.}7143$ KOhms

c$.2$ KOhms, $1\mathrm{.}6$ KOhms

d$.2$ KOhms, $2\mathrm{.}5$ KOhms

e$.2$ KOhms, $3\mathrm{.}2$KOhms