What is a good rule of thumb for the length of subject lines and headlines intended for

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What is a good rule of thumb for the length of subject lines and headlines intended for mobile readers?

a. Two words, three at a most

b. As long as the device’s screen is wide in landscape mode 

c. Around 25 characters d. Around 25 words

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Related Book For  answer-question

Excellence In Business Communication

ISBN: 9780134319056

12th Edition

Authors: John Thill, Courtland Bovee

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