A dealer may legally issue which type of temporary registration permit?

Answer: B — 7-day permit upon sale

A dealer is legally permitted to issue a 7-day temporary registration permit upon the sale of a vehicle. This type of permit allows the buyer to operate the vehicle legally while awaiting the completion of the official registration process. It is critical for dealers to provide this temporary permit to facilitate immediate use of the vehicle, ensuring that buyers can drive their newly purchased vehicles without interruption. This temporary registration serves as a bridge period to allow sufficient time for the transfer of title and registration with the state authorities, which can sometimes take longer due to processing delays. The 7-day window aligns with Colorado's regulations around temporary permits, providing a necessary provision for both dealers and buyers. Other options do not fit within the legal framework established for temporary registration permits. For instance, a 14-day or 30-day permit for out-of-state buyers may not be authorized under Colorado law for temporary vehicle use. Similarly, a permanent registration permit does not exist in this context, as it refers to the official and final registration, not a temporary measure.