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

Which statements are true regarding undefinable terms in geometry? Check all that apply.
a. A point in the form (x, y) has two dimensions.
b. A plane has a definite beginning and end.
c. A line has one dimension, length.
d. A point consists of an infinite set of lines.
e. A plane consists of an infinite set of lines.