In which decade was the telegraph invented?

In which decade was the telegraph invented?

1. 1810s

2. 1840s

3. 1870s

4. 1890s

Correct Option: Option B,

1840s

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Developed in the 1830s and 1840s by Samuel Morse (1791-1872) and other inventors, the telegraph revolutionized long-distance communication. It worked by transmitting electrical signals over a wire laid between stations.