20 Constitution of Kenya, 2010 (b) adopt the interpretation that most favours the enforcement of a right or fundamental freedom. (4) In interpreting the Bill of Rights, a court, tribunal or other authority shall promote–– (a) the values that underlie an open and democratic society based on human dignity, equality, equity and freedom; and (b) the spirit, purport and objects of the Bill of Rights. (5) In applying any right under Article 43, if the State claims that it does not have the resources to implement the right, a court, tribunal or other authority shall be guided by the following principles–– (a) it is the responsibility of the State to show that the resources are not available; (b) in allocating resources, the State shall give priority to ensuring the widest possible enjoyment of the right or fundamental freedom having regard to prevailing circumstances, including the vulnerability of particular groups or individuals; and (c) the court, tribunal or other authority may not interfere with a decision by a State organ concerning the allocation of available resources, solely on the basis that it would have reached a different conclusion. Implementation of rights and fundamental freedoms. 21. (1) It is a fundamental duty of the State and every State organ to observe, respect, protect, promote and fulfil the rights and fundamental freedoms in the Bill of Rights. (2) The State shall take legislative, policy and other measures, including the setting of standards, to achieve the progressive realisation of the rights guaranteed under Article 43. (3) All State organs and all public officers have the duty to address the needs of vulnerable groups within society, including women, older members of society, persons with disabilities, children, youth, members of minority or marginalised communities, and members of particular ethnic, religious or cultural communities. (4) The State shall enact and implement legislation to fulfil its international obligations in respect of human rights and fundamental freedoms.