A half-infinite line (also known as a half-line) with one of the two points is commonly used to represent a ray. The correct option is B.
What is a ray?
A half-infinite line (also known as a half-line) with one of the two points is commonly used to represent a ray. It is assumed to be infinite.
The endpoint of a ray is the point of the ray that does not have an arrow but instead has a point, therefore, the endpoint of the ray is point S.
Hence, the correct option is B.
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