Final answer:
Single-mode Fiber is the type of fiber-optic cable capable of transmitting data over longer distances, is made of glass, and can be one or two strands.
Step-by-step explanation:
The type of fiber-optic cable that can go 50 times farther, is typically made of glass, and can be composed of one or two strands of fiber is Single-mode Fiber. This type of fiber-optic cable is designed for long-distance telecommunication and high-speed data connectivity, making it suitable for extensive optical fiber cables placed on the ocean floor and underground. Its main advantages include low loss, where light can travel many kilometers before needing amplification, high bandwidth, which allows a significant amount of data to be transmitted simultaneously, and reduced crosstalk, where optical signals do not interfere with each other.