E) Audible signal only? That's like a fire alarm that just goes 'ding ding ding' - how am I supposed to know something's wrong? Where's the flashing lights and blaring siren?
C) Displaying 'ALERT' with no sound? That's like a silent alarm - totally useless. I need something that's going to wake me up and make me jump into action!
D) By displaying the word 'ALERT' with audible signal seems like the most complete and intuitive alert mechanism. Who doesn't love a good siren when things go wrong?
Myong
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