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

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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 triangle indicates active-HIGH

(d) A triangle indicates active-LOW

I had been asked this question in semester exam.

This interesting question is from Parity Generators/Checkers topic in division Combinational Circuits of Digital Circuits

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The correct answer is (b) A bubble indicates active-LOW

For explanation: A bubble indicates active-LOW in a decoder always. Enable pin of the decoder is usually active-LOW and is triggered on the input being at 0.

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