The plane uniquely determined by x-axis and y-axis
is known as

Options

A. XY-plane
B. YZ-plane
C. XZ-plane
D. None of these

Answer

To solve the question, we need to identify the plane that is uniquely determined by the x-axis and y-axis.

### Step-by-Step Solution:

1. **Understanding Axes**:
- The x-axis is the horizontal line in a three-dimensional coordinate system where the y-coordinate and z-coordinate are both zero.
- The y-axis is the vertical line in a three-dimensional coordinate system where the x-coordinate and z-coordinate are both zero.

2. **Defining the Plane**:
- A plane in three-dimensional space can be defined by two lines (axes in this case). The plane formed by the x-axis and y-axis will include all points where the z-coordinate is constant.

3. **Identifying the Plane**:
- The plane that includes all points (x, y, 0) where z is equal to zero is known as the xy-plane. This means that for any point on this plane, the z-coordinate is always zero.

4. **Conclusion**:
- Therefore, the plane uniquely determined by the x-axis and y-axis is the **xy-plane**.

### Final Answer:
The plane uniquely determined by the x-axis and y-axis is known as the **xy-plane**.

---