The messageChannel class declares the Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â class attribute that defines the key string.

The messageChannel class declares the Â Â Â Â Â Â Â Â�

1.	The messageChannel class declares the Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â class attribute that defines the key string.
A.	command_key
B.	command-key
C.	commandkey
D.	key_command
Answer» B. command-key