Answer:
FIRST CLASS MAIL
Step-by-step explanation:
First-class mail is used for postcards, letters, large envelopes, and small packages. First-class mail must weigh 13 ounces or less. First-class delivery is given priority over standard mail, and local mail because they weigh less.
First class mail is the most popular and economical way to send standard postcards, letters, large envelopes, all Bills and all materials sealed against postal inspection.