What was the significance of Thomas Edison’s laboratory at Menlo Park?

What was the significance of Thomas Edison’s laboratory at Menlo Park?

a. It was where Edison first invented the telegraph.
b. It was the first modern research laboratory ever built.
c. It was where the telephone was finally perfected.
d. It was the site of the first power station in New York.
e. It was where Edison first sent a message over telephone wires.

ANSWER
B