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:
| Date | City | Opponent | Results¹ | Type of game |
| --- | --- | --- | --- | --- |
| March 25 | Banja Luka | Austria | 4:0 | Friendly |
| April 29 | Belfast , Northern Ireland | Northern Ireland | 2:1 | Euro '88 Qualifier |
| August 29 | Belgrade | USSR | 0:1 | Friendly |
| September 23 | Pisa , Italy | Italy | 0:1 | Friendly |
| October 14 | Sarajevo | Northern Ireland | 3:0 | Euro '88 Qualifier |
| November 11 | Belgrade | England | 1:4 | Euro '88 Qualifier |
| December 16 | İzmir , Turkey | Turkey | 3:2 | Euro '88 Qualifier |
Question:
What day was the opponent Austria?
Answer:
March 25