What is the maximum size for a postcard in terms of height, length, and thickness?

In this context, the maximum size for a postcard is defined by specific dimensions set by USPS regulations. The correct answer indicates that a postcard can have a height of 4 1/4 inches, a length of 6 inches, and a thickness of 0.016 inches, aligning with the requirements for postcards as stated by USPS.

This answer adheres to the standard dimensions that postal services accept for postcards, ensuring they can be processed effectively through the mailing system. Postcards must meet these criteria to qualify for certain postal rates and to be eligible for the “postal card” classification, which is often less expensive than other types of mail.

The other options do not conform to the established maximum dimensions for postcards according to USPS policies. They either exceed the allowable height, length, or thickness, which would disqualify them from being categorized as postcards. Understanding these specific measurements is crucial for ensuring that mail preparation complies with postal regulations.