The time lag, between the keying of the last character on the keyboard input and the appearance of the first output character on the screen, is known as A. Key B. System review C. response time D. batch Processing E. None of the above

The correct answer is C. response time.

Response time is the time it takes for a system to react to an input. In the context of a keyboard, response time is the time it takes for the computer to display the character that was typed on the keyboard.

Key is the physical object that is pressed to input a character. System review is the process of checking the system for errors. Batch processing is a type of processing in which a group of tasks are executed together.

None of the above is not a correct answer.