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

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

(a) command_key

(b) command-key

(c) commandkey

(d) Key_command

I have been asked this question in a national level competition.

I would like to ask this question from Sending and Receiving Data in Real Time Through Internet topic in chapter Working with the Cloud of IOT

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Right option is (a) command_key

Explanation: The messageChannel class declares the command_key class attribute that defines the key string that defines what the code will understand as the command.

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