In specific application, the temperature is needed to be measured. In order to do so; a thermometer that reacts for every $0\mathrm{.}60C$ change of temperature is used. Given that the used device requires $1\mathrm{.}60sec$ to settle for proper temperature reading. If the temperature changed from $21\mathrm{.}06C$ to $21\mathrm{.}00C,$ then the reading of the thermometer is:

Select one:

a$.21\mathrm{.}60C$

b$.$ None

C$.20\mathrm{.}06C$

d$.21\mathrm{.}00C$

e$.21\mathrm{.}06C$