Sending a busy manager a long email represents a problem in which area of the communication process? message decoder, sender, message encoder, message channel

Message encoding includes selecting and organizing a message. Messade decoding includes interpreting a message. Sender is the person who sends the message (the e-mail). Channel is the way in which the sender and the receiver of the message communicate (note, conversation, e-mail). In our case it is e-mail. 
Sending a busy manager a long email represents a problem in the message decoder as an area of the communication process, because the manager is too busy and may be not able to read the message.

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He developed the concept of linear perspective, and he had the ability to solve architectural problems using mathematics.