1. The competent authority of a Member State shall without prior request forward the information referred to in Article 1(1), of which it has knowledge, to the competent authority of any other Member State concerned, in the following circumstances:
(a) the competent authority of the one Member State has grounds for supposing that there may be a loss of tax in the other Member State;
(b) a person liable to tax obtains a reduction in or an exemption from tax in the one Member State which would give rise to an increase in tax or to liability to tax in the other Member State;
(c) business dealings between a person liable to tax in a Member State and a person liable to tax in another Member State are conducted through one or more countries in such a way that a saving in tax may result in one or the other Member State or in both;
(d) the competent authority of a Member State has grounds for supposing that a saving of tax may result from artificial transfers of profits within groups of e