How should the Campaign developer meet this requirement?

A Campaign developer must store a dynamically created email subject line code from a campaign workflow.

How should the Campaign developer meet this requirement?
A . Extract subject line code to a file from the campaign workflow and use the file in reports or re-marketing workflows
B . Modify the email delivery to write the subject line code to a custom schema
C . Write a custom JavaScript code in the campaign workflow to store subject line code in custom schema
D . Modify the target mapping used in delivery to log subject line code as "additional parameter” in the delivery logs

Answer: B