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:
| Number | Name of administrative unit | Telephone (052) | Area (km 2 ) | Population (people) |
| --- | --- | --- | --- | --- |
| 1.0 | Hoàn Lão township | 3862242 | 5.42 | 7247.0 |
| 2.0 | Nông trường Việt Trung township | 3796007 | 86.00 | 9506.0 |
| 3.0 | Bắc Trạch rural commune (rc) | 3866086 | 17.24 | 6413.0 |
| 4.0 | Cự Nẫm rc | 3675552 | 32.79 | 7562.0 |
| 5.0 | Đại Trạch rc | 3862161 | 24.80 | 9043.0 |
| 6.0 | Đồng Trạch rc | 3864451 | 6.44 | 5615.0 |
| 7.0 | Đức Trạch rc | 3864192 | 2.49 | 6529.0 |
| 8.0 | Hạ Trạch rc | 3866406 | 17.83 | 4721.0 |
| 9.0 | Hải Trạch rc | 3864218 | 1.97 | 8707.0 |
| 10.0 | Hoà Trạch rc | 3862820 | 22.00 | 4612.0 |
| 11.0 | Hoàn Trạch rc | 3862435 | 7.71 | 3501.0 |
| 12.0 | Hưng Trạch rc | 3675051 | 95.12 | 10959.0 |
| 13.0 | Lâm Trạch rc | 3679371 | 27.92 | 3387.0 |
| 14.0 | Liên Trạch rc | 2212693 | 27.70 | 3939.0 |
| 15.0 | Lý Trạch rc | 3862279 | 21.77 | 4138.0 |
| 16.0 | Mỹ Trạch rc | 3866401 | 9.38 | 3464.0 |
| 17.0 | Nam Trạch rc | 3862628 | 19.14 | 3201.0 |
| 18.0 | Nhân Trạch rc | 3862134 | 2.44 | 9028.0 |
| 19.0 | Phú Định rc | 2212309 | 153.58 | 2653.0 |
| 20.0 | Phú Trạch rc | 3864211 | 13.18 | 3988.0 |
| 21.0 | Phúc Trạch rc | 3679731 | 60.10 | 9866.0 |
| 22.0 | Sơn Lộc rc | 3864549 | 11.72 | 212.0 |
| 23.0 | Sơn Trạch rc | 3675055 | 101.2 | 987.0 |
| 24.0 | Tân Trạch rc | (099) 452001 | 362.81 | 228.0 |
| 25.0 | Tây Trạch rc | 3862760 | 27.30 | 4979.0 |
| 26.0 | Thanh Trạch rc | 3655470 | 24.35 | 11107.0 |
| 27.0 | Thượng Trạch rc | (099) 452003 | 725.71 | 1823.0 |
| 28.0 | Trung Trạch rc | 3862763 | 10.59 | 5019.0 |
| 29.0 | Vạn Trạch rc | 3678324 | 27.43 | 6662.0 |
Question:
Name the number of administrative unit for number 4
Answer:
Cự Nẫm rc