To guarantee that the individual sending a document really is who he or she claims to be, which of the following should be done?

A) Add a watermark.
B) Add a digital signature.
C) Add a header.
D) Check the document for accessibility.

Digital Signature

An electronic form of signature that provides a secure and verifiable way to sign digital documents, ensuring authenticity and integrity.

Watermark

A faint design or mark, often used in paper or digital documents, to indicate authenticity, ownership, or status.

Document Accessibility

The practice of making documents accessible to people with disabilities, involving the use of specific formats and features to ensure readability by assistive technologies.