Question

When the smart bell is pressed and of no one answers, after
ten seconds
[a]It calls the owner's mobile phone
[b]It starts producing black noise
[c]It sounds alarm of danger
[d]It rings as regular bell
lamo
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Answer 1

Explanation:

एक कॉल द ओनर्स मोबाइल फोन

Answer 2

Answer:

when the smart bell is pressed it waits for 10 sec

and checks if the owner