Final answer:
The U.S. Postal Service considers a standardized address as one that is fully spelled out using the postal service standard abbreviations. This address format ensures uniformity in the mail delivery system.
Step-by-step explanation:
The U.S. Postal Service defines a standardized address as an address that is fully spelled out and only abbreviated using the postal service standard abbreviations. This means the correct answer to the question is 1) An address that is fully spelled out and only abbreviated using the postal service standard abbreviations. A standardized address is designed to ensure uniformity and efficiency in mail delivery and is part of a larger system that helps with location identification. When writing an address, whether it's the recipient's or the sender's, it needs to be in the standard format with appropriate abbreviations for elements like Street (St.), Avenue (Ave.), and Boulevard (Blvd.), following the guidelines established by the postal service. This standardization is crucial for the postal system, similar to how absolute and relative locations work within geography to identify specific points or regions on a map.