Geometry

The correct answer is D. , .

1. Recall the definition of an angle formed by rays:

An angle is formed by two rays that share a common endpoint (the vertex). The rays are named starting from the vertex and extending outwards.

For , the vertex is .

One ray starts from  and passes through , which is written as . The other ray starts from  and passes through , which is written as .

2. Analyze each option:

A: Rays are named with a starting - point and an arrow - direction.  and  are not proper ray notations for forming

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