Final answer:
A transmittal memo is the document that is included with a package being sent to provide details about the contents, origin, recipient, and purpose of the package.
Step-by-step explanation:
A transmittal memo is the correct term for a memo that accompanies a package of materials to indicate that information is being sent from one location to another. This type of memo serves as a cover note, explaining the contents of the package, who it is from, who it is intended for, and its purpose or importance. It is crucial for ensuring that the recipient understands why they are receiving the package and what action they might need to take upon receipt.