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:
| Year | Division | League | Reg. Season | Playoffs | Open Cup |
| --- | --- | --- | --- | --- | --- |
| 1994.0 | 3 | USISL | 4th, Northeast | Divisional Finals | Did not enter |
| 1995.0 | 3 | USISL Pro League | 2nd, Capital | 1st Round | Did not qualify |
| 1996.0 | 3 | USISL Pro League | 2nd, Northeast | Sizzling Six | Did not qualify |
| 1997.0 | 3 | USISL D-3 Pro League | 1st, Northeast | Division Semifinals | Did not qualify |
| 1998.0 | On hiatus | On hiatus | On hiatus | On hiatus | On hiatus |
| 1999.0 | 3 | USL D-3 Pro League | 8th, Northern | Did not qualify | Did not qualify |
| 2000.0 | "4" | USL PDL | 5th, Northeast | Did not qualify | Did not qualify |
| 2001.0 | "4" | USL PDL | 5th, Northeast | Did not qualify | Did not qualify |
Question:
What league did they play in 2001?
Answer:
USL PDL