Final answer:
The ST connector is used with fiber optic cables and connects with a twisting motion. Refraction is a key phenomenon in the functionality of fiber optic cables by allowing light to be guided through the core of the fiber.
Step-by-step explanation:
The connector used with fiber optic cables that connects using a twisting motion is the B. ST connector. ST stands for Straight Tip, which is a type of fiber optic connector that uses a bayonet mount locking mechanism requiring a half-turn twisting motion to securely lock the connector in place. This type of connector has been widely used due to its reliability and durability.
Refraction is a phenomenon where light changes direction as it passes from one medium to another, which is indeed useful in fiber optic cables for transmitting signals. This is because refraction allows the light to be contained within the core of the fiber, enabling efficient signal transmission over long distances. Therefore, the statement in question 12 is true.