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:
| Callsign | Area served | Frequency | Band | Fate | Freq currently | Purpose |
| --- | --- | --- | --- | --- | --- | --- |
| 5AD | Adelaide | 1323 | AM | Swapped calls with 5DDN to become 5DN in 1994 | 5DN | Commercial |
| 5CL | Adelaide | 0 729 | AM | Changed call to 5RN in 1991 | 5RN | National |
| 5DDN | Adelaide | 102.3 | FM | Swapped calls with 5AD to become 5ADD in 1994 | 5ADD | Commercial |
| 5DN | Adelaide | 0 972 | AM | Moved to FM in 1990 as 5DDN (see also 5AD ) | 5PB | Commercial |
| 5KA | Adelaide | 1197 | AM | Moved to FM in 1990 as 5KKA | 5RPH | Commercial |
| 5KKA | Adelaide | 104.7 | FM | Changed call to 5MMM in 1994 | 5MMM | Commercial |
| 5PI | Port Pirie | 1044 | AM | Changed call to 5CS in 1987 | 5CS | Commercial |
| 5UV | Adelaide | 0 531 | AM | Moved to FM in 2001, retained call | Radio 531 (HPON) | Community |
Question:
Which area served has a Callsign of 5ddn?
Answer:
Adelaide