Who is responsible for ensuring that individual and organizational information systems are reliable, secure, efficient, and supportable?

Chief information officer

Explanation:

The Chief Information Officer is responsible for ensuring that individual and organizational information systems are reliable, secure, efficient, and supportable. The duties of the CIO also includes;

1. developing and maintaining information security policies, procedures, and control techniques to address all applicable requirements,

2. overseeing personnel with significant responsibilities for information security and ensuring that the personnel are adequately trained

3. Ensuring that the organization-wide information security program is effectively implemented.