Which of the Following Is True Regarding Media Placement Costs

Which of the following is true regarding media placement costs on social media?

A) There are no direct media costs,but the use of social media platforms is not free.
B) The use of social media platforms is entirely without cost.
C) The only expenses companies have to pay are the direct media costs.
D) Social media platforms are among the most expensive on which to place media.
E) Social media usage is free,but its effectiveness is uncertain.