A project manager receives a project charter from a key stakeholder via email. Which of the following BEST ensures the project charter was not altered after the stakeholder sent it?
Digital signature
Antivirus software
Strong password
Disk encryption
A digital signature provides integrity, authentication, and non-repudiation. Its primary function in this context is to ensure integrity, which confirms that the document has not been altered since it was signed. If any changes were made, the signature verification would fail. Disk encryption protects data at rest but does not prevent alteration of a file once the disk is decrypted and in use. A strong password is a form of authentication but does not protect a document from being altered after it is accessed. Antivirus software scans for and removes malicious software but does not verify the integrity of individual documents against unauthorized changes.
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