When is a level-shifter circuit needed in interfacing logic?

1.	When is a level-shifter circuit needed in interfacing logic?
A.	a level shifter is always needed.
B.	a level shifter is never needed.
C.	when the supply voltages are the same
D.	when the supply voltages are different
Answer» E.

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When is a level-shifter circuit needed in interfacing logic?

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