Which two best practices should the marketer use to make the subject line more effective?

An email marketer has been tasked with increasing open rates on a weekly newsletter that currently uses a consistent, identifiable subject line: “NTO Weekly: Topics of interest this week.”

Which two best practices should the marketer use to make the subject line more effective? (Choose two.)
A . Include “RE:”, “FWD:”, “etc.” to get the reader’s attention.
B . Keep the subject text between 50 and 100 characters long.
C . Include information relevant to the message in the subject line.
D . A/В test the effectiveness of different subjects.

Answer: CD