Which one among the following components is used as an amplifying device? - निम्नलिखित में से कौन-सा घटक प्रवर्धक साधन के रूप में प्रयुक्त होता है?

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Which one among the following components is used as an amplifying device? - निम्नलिखित में से कौन-सा घटक प्रवर्धक साधन के रूप में प्रयुक्त होता है?