Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Rank | Player | Year | Opponent | Passing yards | Rushing yards | Total offense |
| --- | --- | --- | --- | --- | --- | --- |
| 1.0 | Devin Gardner | 2013.0 | Indiana | 503.0 | 81.0 | 584.0 |
| 2.0 | Denard Robinson | 2010.0 | Notre Dame | 244.0 | 258.0 | 502.0 |
| 3.0 | Denard Robinson | 2010.0 | Indiana | 277.0 | 217.0 | 494.0 |
| 4.0 | Denard Robinson | 2011.0 | Northwestern | 337.0 | 117.0 | 454.0 |
| 5.0 | Denard Robinson | 2011.0 | Notre Dame | 338.0 | 108.0 | 446.0 |
| 6.0 | Denard Robinson | 2012.0 | Air Force | 208.0 | 218.0 | 426.0 |
| 7.0 | Denard Robinson | 2012.0 | UMass | 291.0 | 106.0 | 397.0 |
| 8.0 | Denard Robinson | 2010.0 | Connecticut | 186.0 | 197.0 | 383.0 |
| 9.0 | Denard Robinson | 2010.0 | Penn State | 190.0 | 191.0 | 381.0 |
Question:
Who was the opponent when there was 117 rushing yards?
Answer:
Northwestern