[Solved] To identify that which key is being pressed, we need to:

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Q.	To identify that which key is being pressed, we need to:
A.	ground all the pins of the port at a time
B.	ground pins of the port one at a time
C.	connect all the pins of the port to the main supply at a time
D.	none of the mentioned
Answer» B. ground pins of the port one at a time

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