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:
| City of license | Identifier | Frequency | Power | Class | RECNet |
| --- | --- | --- | --- | --- | --- |
| Belleville | CJBC-1-FM | 94.3 FM | 34950 s watt | B | Query |
| Kingston | CJBC-2-FM | 99.5 FM | 1560 watts | A | Query |
| London | CJBC-4-FM | 99.3 FM | 22500 watts | B | Query |
| Penetanguishene | CJBC-3-FM | 96.5 FM | 15300 watts | B | Query |
| Peterborough | CJBC-5-FM | 106.3 FM | 13000 watts | B | Query |
Question:
what is the identifier when the power is 22500 watts?
Answer:
CJBC-4-FM