Please choose the correct ending to complete the given sentence: Finance and Business: [header] How to properly package vinyl records and compact discs for shipping [title] Use proper mailers. [step] Lps and maxi-singles should always be shipped in a sturdy, cardboard mailer (with cardboard inserts) specifically designed for shipping 12-inch records. The length and width of the mailer should both be between 12 ½ to 13 inches (33.0 cm).

Ending1: [title] Make sure it's working properly. [step] The area that includes the contact details is important. Ending2: It should also be in contact with the record's corresponding ziplock or plastic case. [substeps] When shipping, ensure the label is level and free of brads and suffixes and that any potholder at the edge is not damaged. Ending3: [title] Container containers shipped with vinyl discs should always be quarantined from the outside world. [step] Usps regulations require a container with a strong top. Ending4: The height or thickness will depend on the number of discs being shipped. When packing an lp, follow these steps : [title] Place at least one 12 " x 12 " cardboard insert into the bottom of the mailer box.

Answer format: ending1/ending2/ending3/ending4