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:
| Team | Head Coach | Years at School | Overall Record | Record at School | ACC Record |
| --- | --- | --- | --- | --- | --- |
| Boston College | Frank Spaziani | 3.0 | 9–5 | 9–5 | 5–3 |
| Clemson | Dabo Swinney | 3.0 | 13–8 | 13–8 | 9–4 |
| Duke | David Cutcliffe | 3.0 | 53–44 | 9–15 | 4–12 |
| Florida State | Jimbo Fisher | 1.0 | 1–0 | 1–0 | 0–0 |
| Georgia Tech | Paul Johnson | 3.0 | 126–46 | 20–7 | 12–4 |
| Maryland | Ralph Friedgen | 10.0 | 66–46 | 66–46 | 38–34 |
| Miami | Randy Shannon | 4.0 | 21–17 | 21–17 | 11–13 |
| North Carolina | Butch Davis | 4.0 | 71–38 | 20–18 | 11–13 |
| NC State | Tom O'Brien | 4.0 | 91–66 | 16–21 | 9–15 |
| Virginia | Mike London | 1.0 | 24–5 | 0–0 | 0–0 |
| Virginia Tech | Frank Beamer | 24.0 | 229–115–4 | 187–92–2 | 38–10 |
Question:
What is the Record at School of Tom O'Brien's team?
Answer:
16–21