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 | Make & Model | Length | Engine Type | Numbers |
| --- | --- | --- | --- | --- |
| 2000-2004 | Orion VI | ft (m) | Diesel | 6000-6161 (160 buses) |
| 2002 | MCI D4000N | ft (m) | Diesel | 6900-6907 (8 buses) |
| 2003 | NABI 40-LFW | ft (m) | Diesel | 6162-6261 (99 buses) |
| 2003 | NABI 35-LFW | ft (m) | Diesel | 6600-6684 (84 buses) |
| 2005 | NABI 40-LFW | ft (m) | Diesel | 6262-6322 (60 buses) |
| 2006-2010 | ElDorado National EZ-Rider II | ft (m) | Diesel | 2600-2825 (223 buses) |
| 2012 | ElDorado National EZ-Rider II BRT | ft (m) | Diesel | 2826-2829 (4 buses) |
| 2012 | Orion VII "3rd Generation" | ft (m) | Diesel-Electric | 2830-2831 (2 buses) |
| 2012-2013 | ElDorado National Axess | ft (m) | Diesel | 6323-6376 (54 buses) |
| 2013 | ElDorado National Axess Suburban | ft (m) | Diesel | 6377-6391 (15 buses) |
| On Order | On Order | On Order | On Order | On Order |
| 2014 | ElDorado National Axess | ft (m) | CNG | TBD (91 buses) |
| 2014 | MCI D4000CT and/or D4000CL | ft (m) | Diesel | TBD (13 buses) |
Question:
If length is ft (m) with numbers of 6600-6684 (84 buses) for 2003, what is the engine type?
Answer:
Diesel