Task: Instance Description Understanding (ontology: Sciences/Computer_Science)

Which of the following definitions best describes the instance 'meter'?

A. A length unit which is equal to 10 [-10] m.
B. A length unit which is equal to the length of the path traveled by light in vacuum during a time interval of 1/299 792 458 of a second.
C. A length unit which is equal to one millionth of a meter or 10^[-6] m.
D. A length unit which is equal to one thousandth of one millionth of a meter or 10^[-9] m.

Answer: A length unit which is equal to the length of the path traveled by light in vacuum during a time interval of 1/299 792 458 of a second.