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Most routine mail and standard-sized envelopes are sent:

  1. Priority mail

  2. First-Class mail

  3. Express mail

  4. Media mail

The correct answer is: First-Class mail

The classification of most routine mail and standard-sized envelopes as First-Class mail is accurate due to the specific services and features provided by this mailing option. First-Class mail is designed for personal and business correspondence, allowing for a variety of mail types, including letters and parcels weighing up to 13 ounces. It offers quicker delivery times, typically within one to three business days, making it a reliable choice for everyday communications. First-Class mail also provides the advantage of forwarding and return services, which are particularly useful for maintaining communication efficiency. The affordability and efficiency of First-Class mail make it the most common choice for mailing standard letters and documents regularly. In contrast, Priority mail is meant for packages that may require faster shipping but is generally used for heavier items or larger parcels. Express mail offers expedited delivery services at a premium price for urgent shipments, ensuring delivery within one to two days but is not necessary for everyday correspondence. Media mail is a specific service designed for the shipping of educational materials, books, and other media at lower rates, but it has restrictions on the types of items that can be shipped and is not applicable to routine personal or business mail.