Which subject line is most informative?
กTraining attendance information and several related matters
ขAction required: Confirm training attendance by 12 July
คImportant update concerning a future staff activity
งPlease read this message when you have enough time
เฉลยอธิบาย
A useful subject line states the required action and deadline. The other options each alter or violate a specific part of that meaning or rule. The other options each alter or violate a specific part of that meaning or rule.