The only factor to consider when deciding if a business letter is ...

[Mr.Thesaxman]

The only factor to consider when deciding if a business letter is the appropriate communication channel is if you are writing to a secondary audience.
  Indicate whether the statement is true or false

Question 2

Letters are the preferred channel of communication for delivering messages inside an organization.
  Indicate whether the statement is true or false

[Qarqy]

Answer to Question 1

False

Answer to Question 2

False