When you're determining the best way to distribute a business message,consider

A) cost of distributing the message.
B) convenience for you and your audience.
C) security and privacy concerns.
D) all of the above.

All of the above should be considered when determining the best way to distribute a business message. The cost of distribution should be factored in to ensure it is cost-effective for the business. The convenience for both the business and the audience should also be considered, as it affects the effectiveness of the message. Lastly, security and privacy concerns should be taken into consideration to ensure the message is protected and private information is kept secure.