Given the task definition and input, reply with output. In this task, you are provided with an article of the legal acts. Your task is to classify it into three categories (Regulation, Decision and Directive) based on its content: 1) Regulation is a binding legislative act that must be applied in its entirety on a set date across all the member states (European Union countries). 2) Decision is binding on those to whom it is addressed (e.g. an European Union country or an individual company) and is directly applicable. 3) Directive is a legislative act that sets out a goal that all must achieve. However, it is up to the individual countries to devise their own laws on how to reach these goals.

In Article 4 of Decision 72/173/EEC of 26 April 1972, the expression '100 million Belgian francs' is replaced by 'three million European units of account'.In Article 2 of Decision 75/397/EEC of 17 June 1975, the expression 'two million u.a.' is replaced by 'three million European units of account'. The rate of exchange for the European unit of account in terms of national currencies to be used during each year shall be that for the first day of the year for which exchange values for the European unit of account into all the currencies of the Community are available. This Decision is addressed to the Kingdom of Belgium.
Decision