How should the Campaign developer accomplish this task?

A Campaign developer is sending proofs for an email delivery. The Campaign developer must indicate what time the proof was generated in the proof email subject line.

How should the Campaign developer accomplish this task?
A . In the delivery properties > advanced, edit the proof properties and define a JavaScript block to calculate the current timestamp
B . In the delivery properties > advanced, edit the proof properties to append the current date time stamp when sending the proof
C . While sending proofs, manually change the subject line to include the current date time
D . Code the email delivery to dynamically append the date time in the subject line if a proof is being sent

Answer: B

Explanation:

Reference: https://docs.adobe.com/content/help/en/campaign-classic/using/sending-messages/key-steps- when-creating-a-delivery/steps-validating-the-delivery.html