Point is undefined term among all the given options.
The undefined terms are those which can not be defined.
So, we will consider all the four options given
Point is an undefined term because it can not be defined it can be drawn anywhere.
Hence, option A is correct.
segment join two points hence, it is defined between those two pints.
Hence, Option B is not correct.
plane is a straight line between two points hence, it is defined between two points
Hence, option C is incorrect.
Angle is measure between two lines that are intersecting or between two surfaces hence, defined
Hence, Option D is not correct.