What are five communication skills necessary to effectively use this medium?

What are five communication skills necessary to effectively use this medium?
a. The capacity to provide accurate information in written form
b. The ability to compose a coherent and understandable written message
c. The capability to determine the information needs of the receiver
d. The ability to create a readable document
e. An understanding of the urgency, or lack thereof, with which the faxed information is needed