Fill in the blanks.
Rotation turns an object about a __P__ point. The fixed point is the centre of __Q__ . The angle by which the object rotates is the __R__.
| P | Q | R | |
| A | fixed | rotation | angle of rotation |
| B | variable | rotation | central angle |
| C | fixed | angle of rotation | rotation |
| D | variable | rotation | angle of rotation |