What is the difference of the matrices shown below?
| -4 8 | - | 2 1 | =
| 3 12| |-14 15 |

a. | 6 7 |
| 17 -3 |
b. | 6 7 |
| 17 -3|
c. | -2 9 |
| -11 27|
d. | 9 -2 |
| 27 -11|