Which of the following describes the set using set-builder notation?
OA. x is a rational number
OB. {x | x is a rational number}
OC. {1/2, 1/3, 1/4, 1/5, ...}
OD. x | x is a rational number
OE. {x | rational numbers}
OF. {rational numbers}
OG. {x is a rational number}