Given the Coordinate Plane as shown in the picture, name the two parts marked with '?'.

One of the part marked '?' is the y-axis. This axis is also known as vertical axis.

The other part is Quadrant 4.

Note that the Coordinate Plane has 4 quadrants and the sequence of each quadrant is in anti-clockwise order

From Step 1 & 2, clearly the answer for this question is C.

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