Final answer:
Rule 605 requires market centers to release monthly reports detailing the order execution quality of equity securities, which includes speed and price quality.
Step-by-step explanation:
Rule 605 of Regulation NMS mandates that each market center that executes orders of equity securities must publicly disclose monthly electronic reports. These reports must detail the quality of execution for transactions in terms of order execution speed and the likelihood of execution at the best prevailing market prices. The aim is to increase transparency and facilitate comparison of execution quality among different market centers.