Which statement is true regarding the checkpoint cell in Mimecast?

The statement that the checkpoint cell must be included in any import operation is accurate because the checkpoint cell serves as a mechanism to ensure data integrity and prevent duplicates during the import process. By including this cell, Mimecast can properly track changes and assess the validity of the incoming data against existing records. It acts as a reference point that helps maintain consistency in the database and assists in managing updates more efficiently. Therefore, its inclusion is critical for successful data imports, making it a necessary component of the process.

In contrast, the other statements do not accurately reflect the role of the checkpoint cell. Whether data comes from external addresses or internal sources, the necessity of the checkpoint cell remains the same for all import operations. Additionally, while there might be certain permissions regarding who can modify data within the system, saying that only admins can modify the checkpoint cell oversimplifies the access control mechanisms in place in Mimecast.