john_doe@company 7. alice@nonexistent.invalid 8. admin@company123 Email addresses: john.doe@example.com,jane@smith-family.net,support@company.co.uk,admin@company123 **Explanation:** - "john.doe@example.com" is a valid email address, as it follows the standard email format with a username, an "@" symbol, and a domain. - "jane@smith-family.net" is a valid email address, although "smith-family" contains a hyphen which is allowed in domains. - "support@company.co.uk" is a valid email address with a domain that includes a "." before the top-level domain (TLD). - "info@subdomain.example.org" is a valid email address with a subdomain. - "john_doe@company" is missing the "." before the TLD, so it's not a valid email address. - "invalidemail: not.an.email.com" lacks the "@" symbol. - "admin@company123" is missing the TLD, but in case-insensitive Unicode, the email "admin@company123" is considered valid if we allow single-level TLDs. - "not.an.email.com" and "@missing-username.com" are not valid as they miss the "@" symbol. - Hence, the valid emails are "john.doe@example.com,jane@smith-family.net,support@company.co.uk,admin@company123". **Note:** The two "invalid" entries are excluded as they do not meet the standard email format requirements with the "@" symbol.