A user attempts to send an email to an external domain and quickly receives a bounce-back message. The user then contacts the help desk stating the message is important and needs to be delivered immediately. While digging through the email logs, a systems administrator finds the email and bounce-back details: Your email has been rejected because It appears to contain SSN Information. Sending SSN information via email external recipients violates company policy. Which of the following technologies successfully stopped the email from being sent? a. DLP
b. UTM
c. WAF
d. DEP