How can the active condition (HIGH or LOW) or the decoder output be determined from the logic symbol?

A square indicates active-HIGH.

A bubble indicates active-HIGH.

How can the active condition (HIGH or LOW) or the decoder output be de

1.	How can the active condition (HIGH or LOW) or the decoder output be determined from the logic symbol?
A.	A bubble indicates active-HIGH.
B.	A bubble indicates active-LOW.
C.	A square indicates active-HIGH.
D.	A square indicates active-LOW.
Answer» C. A square indicates active-HIGH.