A project manager provides a verbal set of instructions to two team members on how to perform a specific test. Without agreeing or disagreeing with the project manager, the two employees leave the project manager's office. Later, the project manager discovers that the tests were not conducted according to his instructions. The most probable cause of failure would be:
A. Improper encoding
B. Improper decoding
C. Improper format for the message
D. Lack of feedback on instructions