For which of the following reasons would a systems administrator leverage a 3DES hash from an installer file that is posted on a vendor’s website?

A systems administrator would leverage a 3DES hash from an installer file to test the integrity of the file. Hashing algorithms like 3DES (though SHA-256 or SHA-3 are more common for integrity checks today) produce a unique fixed-size string of characters from input data. If even a single bit of the file changes, the hash value will be completely different. By comparing the hash provided by the vendor with a hash generated locally from the downloaded file, the administrator can confirm that the file has not been altered or corrupted during download. Validating authenticity typically involves digital signatures, which use asymmetric cryptography to prove the sender's identity and ensure integrity. Activating a license is a separate process, often involving product keys or online verification. While a hash is a type of checksum, "to calculate the checksum of the file" is less precise than "to test the integrity of the file" in this context, as the ultimate goal of comparing checksums is to verify integrity.