Which of the following Google advanced search operators helps an attacker in gathering information about websites that are similar to a specified target URL?

'inurl:' searches for pages that contain a specific keyword within the URL itself, not for finding similar or related websites.

The 'related:' operator instructs Google to return websites that are topically or structurally similar to the specified URL. An attacker can use this to discover competitor sites, peer organizations, or alternative targets that share characteristics with the original target domain, expanding the attack surface mapping.

'info:' displays cached snapshots, backlinks, and metadata about a single specific URL rather than returning a list of similar sites.

'site:' restricts results to a specific domain or subdomain and is used for enumerating indexed pages within a target, not for discovering similar external sites.