Line
A.
C.
D.
B.
Defined
Postulates
Theorems
Undefined
Terms

Undefined

Step-by-step explanation:

In geometry there are three  undefined terms that we use to define other terms:

Point → In geometry a point has a location but no dimension.Plane →  A plane extends is a 2-dimensional surface that extends infinitely on both sides. Line → A line is a one-dimensional undefined figure that extends infinitely in both the directions. It has length but has no width.

Hence, the correct option is "Undefined".

Im pretty sure it’s the first one