1.   Apart from the provision of payment services, payment institutions shall be entitled to engage in the following activities:

(a) the provision of operational and closely related ancillary services such as ensuring the execution of payment transactions, foreign exchange services, safekeeping activities, and the storage and processing of data;

(b) the operation of payment systems, without prejudice to Article 35;

(c) business activities other than the provision of payment services, having regard to applicable Union and national law.