Backward selection evaluates all possible subsets of a dataset with n$=10$ features. If each evaluation takes $0\mathrm{.}01$ seconds, how much total time is required?

a$.0\mathrm{.}15$ seconds

b$.0\mathrm{.}1$ seconds

c$.0\mathrm{.}55$ seconds

Od$.1\mathrm{.}0$ seconds