Who had invented Microphone?

Who had invented Microphone?

1. Cantrell

2. Walker

3. Cartwright

4. Berliner

Correct Option: Option D,

Berliner

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Emile Berliner (May 20, 1851 – August 3, 1929), was a German-American inventor. In 1877 Emile Berliner invents a new kind of microphone. It assures the future of the telephone, but not fame for Berliner. Alexander Graham Bell had already invented his telephone, but without Berliner's carbon-disk or carbon-button microphone, telephones would have sounded terrible for decades.