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The correct answer indicates that there is no service that can be purchased after mailing. Generally, once a package or letter has been mailed, the available options for changing or upgrading its service are limited. Registered mail and Express mail are services that must be specified and paid for at the time of mailing, as they both provide additional levels of tracking, security, and speed. Priority mail also falls into this category, as it is a shipping option that needs to be chosen and paid for when the item is sent out.

Since these services cannot be added post-mailing, the assertion that none of these services can be purchased after mailing is accurate. It’s important for individuals using Postal Service options to be aware of this limitation to ensure they select the appropriate services they need before sending their mail.