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:
| Episode | Broadcast date | Run time | Viewers (in millions) | Archive |
| --- | --- | --- | --- | --- |
| " Episode One " | 26February1972 | 24:40 | 6.4 | RSC converted (NTSC-to-PAL) |
| " Episode Two " | 4March1972 | 24:30 | 9.7 | RSC converted (NTSC-to-PAL) |
| " Episode Three " | 11March1972 | 24:05 | 8.3 | RSC converted (NTSC-to-PAL) |
| " Episode Four " | 18March1972 | 24:21 | 7.8 | PAL 2" colour videotape |
| " Episode Five " | 25March1972 | 24:53 | 8.3 | PAL 2" colour videotape |
| " Episode Six " | 1April1972 | 25:24 | 8.5 | PAL 2" colour videotape |
Question:
What was the archive for the episode with a run time of 25:24?
Answer:
PAL 2" colour videotape