Final answer:
The correct way to name ∠1 is ∠bac, with the point at the angle's vertex (B) placed between the points on the angle's sides (A and C).
Step-by-step explanation:
The student is asking about the different ways to name an angle in geometry. In this case, the name of an angle is typically written with the vertex letter in the middle, so the correct name for ∠1 would be ∠bac, which corresponds to option 2. It is important to note that an angle can be named using the names of three points that define the angle, with the middle letter being the vertex of the angle. For example, if the angle is formed at point B with the points A and C on either side, then the angle can be referred to as ∠bac or ∠cba, with the former being the conventional representation.