Without prejudice to Article 4, there shall be no direct or indirect discrimination on grounds of sex in occupational social security schemes, in particular as regards:

(a) the scope of such schemes and the conditions of access to them;

(b) the obligation to contribute and the calculation of contributions;

(c) the calculation of benefits, including supplementary benefits due in respect of a spouse or dependants, and the conditions governing the duration and retention of entitlement to benefits.