Which statements are true regarding undefinable terms in geometry?

Which statements are true regarding undefinable terms in geometry? Check all that apply.

a. A point has no length or width.
b. A point indicates a location in a coordinate plane.
c. A plane has one dimension, length.
d. A line has a definite beginning and end.
e. A plane consists of an infinite set of lines.
f. A line consists of an infinite set of points.