Choice "D" is correct. Effective management of internal activities is generally characterized by conformity with mandatory guidance of the International Professional Practice Framework (IPPF) including engagement in activities that meet the definition of internal auditing, conformity with International Standards, and adherence to the Code of Ethics.
Choice "a" is incorrect. Objective and relevant assurance is generally viewed as a characteristic of value added services.
Choice "b" is incorrect. Activities that contribute to the effectiveness and efficiency of governance are typically a characteristic of adding value rather than effective management.
Choice "c" is incorrect. Although consultation of practice aids is a useful management tool, the practice aids are considered to be strongly recommended rather than mandatory guidance and are not cited in the performance standards as evidence of effective management.