Which of the following steps detects the key in a 4*4 keyboard matrix about the key that is being pressed?

ensuring that initially, all keys are open

checking that whether the key is actually pressed or not

Which of the following steps detects the key in a 4*4 keyboard matrix

1.	Which of the following steps detects the key in a 4*4 keyboard matrix about the key that is being pressed?
A.	masking of bits
B.	ensuring that initially, all keys are open
C.	checking that whether the key is actually pressed or not
D.	all of the mentioned
Answer» E.