Officer Bateuwi stops Ker$$m$\text{'}$s car for speeding. Upon approaching the car window, Officer Bateuwi asks Kerem to open the trunk, which Kerem then does. Officer Bateuwi

a$.$ must request backup as a witness before searching the trunk.

b$.$ needs a search warrant to search the trunk.

C$.$ does not need a search warrant to search the trunk.

d$.$ may now search the trunk as well as the interior of the car, Kerem, and any passengers.