An Administrator Has Created a Content Filter to Quarantine All

Multiple Choice

An administrator has created a content filter to quarantine all messages that result in an SPF hardfail to review the messages and determine whether a trusted partner has accidentally misconfigured the DNS settings. The administrator sets the policy quarantine to release the messages after 24 hours, allowing time to review while not interrupting business. Which additional option should be used to help the end users be aware of the elevated risk of interacting with these messages?

A) Notify Recipient
B) Strip Attachments
C) Notify Sender
D) Modify Subject