Answer:
A security administrator wants to allow external organizations to cryptographically validate the company's domain name in email messages sent by employee is (D) DKIM
Step-by-step explanation:
To allow external organizations to cryptographically validate the company's domain name in email messages, the security administrator should implement DKIM (DomainKeys Identified Mail). DKIM is an email authentication method that adds a digital signature to the email headers. This signature can be verified by recipients using the public key published in the DNS (Domain Name System) records of the sending domain.
By implementing DKIM, the security administrator ensures that external organizations can verify the authenticity and integrity of the email messages originating from the company's domain. This cryptographic validation helps prevent email spoofing and phishing attacks by confirming that the email has not been tampered with during transit.
DKIM is a crucial component of a comprehensive email security strategy, providing a mechanism for organizations to build trust and establish the legitimacy of their email communications.
Option D is correct.