The following are all types of control within an organisation:
(i) Logical access controls
(ii) Database controls
(iii) Hierarchical passwords
(iv) Range checks

Which of the above controls help to ensure the security of highly confidential information?

A. (i) and (ii) only
B. (i) and (iii) only
C. (i), (ii) and (iii) only
D. All of the above