1. Subject to the approval of the competent authorities, credit institutions permitted to use the IRB Approach in the calculation of risk-weighted exposure amounts and expected loss amounts for one or more exposure classes may apply Subsection 1 for the following:
(a) the exposure class referred to in point (a) of Article 86(1), where the number of material counterparties is limited and it would be unduly burdensome for the credit institution to implement a rating system for these counterparties;
(b) the exposure class referred to in point (b) of Article 86(1), where the number of material counterparties is limited and it would be unduly burdensome for the credit institution to implement a rating system for these counterparties;
(c) exposures in non-significant business units as well as exposure classes that are immaterial in terms of size and perceived risk profile;
(d) exposures to central governments of the Member States and their regional governments, local authorities and administ
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