What are the key ways to improve email deliverability in email marketing? (Choose 4)

What are the key ways to improve email deliverability in email marketing? (Choose 4)
A . Use double Opt-in to avoid getting blacklisted.
B. Maintain a consistent "From Name"
C. Double Check your Subject Line, don’t include RE:, FW:, Hello, Free, Special Offer, Text in all CAPS, and exclamation points!!!
D. Consider Subscriber engagement….send only to most engaged subscribers.
E. Email sign-up on website.
F. Use email templates

Answer: A,B,C,D