Choose two correct statements about a canonical tag:

A canonical tag tells search engines which version of a page is the preferred one to index. Therefore, the canonicalized page and the canonical URL should have identical or very similar content to avoid confusing search engines and ensure the correct content is attributed. Additionally, a canonical tag should always point to a URL that returns an HTTP 200 (OK) status code, indicating the page exists and is accessible. Pointing to a 4xx (client error) or 5xx (server error) status code would render the canonicalization ineffective. A URL can only have one rel-canonical directive; multiple directives would create conflicting signals for search engines. Canonical tag chaining, where page A canonicalizes to page B, and page B canonicalizes to page C, is not recommended as it can confuse search engines and dilute link equity.