Which of the following refers to blacking out portions of the document, usually to protect confidential information, so that it cannot be recovered later?

- Redaction is a form of editing of a physical document by means of censoring, but not necessarily omitting, specific words, sentences, or entire paragraphs.
The portions that need to be redacted are simply blacked out so that they cannot be read.
This is often done in court or government documents in which certain copies that need to go to organizations or individuals, who do not have the right clearance or privilege to know about certain pieces of information, have these portions blacked out.
Source: Techopedia