Option D provides the most complete description because audit resources must be adequate for the audit programme and capable of supporting achievement of the audit objectives, with competent personnel being a critical component. Resources are broader than management personnel, technology or a timescale considered individually. Depending on the programme, they may include auditors and technical experts with appropriate competence, sufficient time, financial resources, audit methods and tools, travel arrangements, information and communication technology, and other logistical support. The overriding requirement is that resources collectively allow audits to be conducted effectively and credibly. ISO/IAF guidance on ISO 19011 specifically states that those managing an audit programme should ensure the audit team ' s competence matches the audit scope and objectives and that adequate resources are available for the audits included in the programme.