What is the main benefit of encrypting a file?

Correct answer: An unauthorised person cannot easily read the content

The governing concept is confidentiality through encryption. Encryption transforms readable data, called plaintext, into protected ciphertext that should be unintelligible without the appropriate key or password. This helps prevent an unauthorised person from understanding the file even if the file is copied or accessed. It does not necessarily reduce size, print the file, or rename it, so option D is correct.