Two, as it is a line.
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it's a plane
In Euclidean geometry, a line is considered to be infinitely long in both directions, meaning it extends indefinitely in both the positive and negative directions along its path. This concept is based on the definition of a line as a straight path with no endpoints. Therefore, mathematically speaking, a line does go on forever.
A line
A line (which by definition goes on to infinity in both directions).
The arrows at the ends of a number line indicate that the line extends forever in both directions (i.e. towards positive infinity and negative infinity)...since there is no largest or smallest real number.