Where should requests for regrading be submitted?

The correct choice is appropriate because it designates the official ETCP address where formal requests, such as those for regrading, are processed. Having a centralized location for the submission of these requests ensures that they reach the relevant department that handles grading and certification inquiries. This organization helps maintain a systematic approach to addressing concerns and ensures that the requests are handled efficiently and in compliance with established protocols.

The other options may represent various addresses associated with the organization but do not correspond to the official submission point for regrading requests. By identifying the correct address, individuals can avoid potential delays or misdirected communication, thus facilitating a smoother process for resolving grading concerns.