Which of the following is a true statement about protecting the confidentiality of client-related ...

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Which of the following is a true statement about protecting the confidentiality of client-related e-mail?

1. Encryption keys prevent viruses or Trojan horses from being attached to e-mail messages.
2. Digital credentials utilize biometric means, such as thumbprint, to verify the identity of the sender.
3. Public key infrastructure (PKI) uses unique codes to confirm the identity of those sending e-mails.
4. Viruses may be transmitted by e-mail messages, so each e-mail should be separately scanned prior to being read.

3 -- Rationale: PKI uses unique codes to verify the identity of the person who is e-mailing the sender. Viruses are transmitted using attachments (not e-mail messages) and may not be picked up with anti-virus programs once messages are encrypted. Encryption is used to prevent unauthorized people from reading e-mail.