Who is primarily responsible for determining the security costs necessary for an organization's information systems?

The Chief Security Officer (CSO) is primarily responsible for determining the security costs necessary for an organization's information systems because their role centers on establishing and overseeing the organization's security strategy and policies. The CSO assesses risks, defines security needs, and allocates resources to protect the organization's assets effectively. This encompasses not only the financial aspect of security but also understanding the technical requirements and the implications of security initiatives on the organization’s overall operations.

In the context of the organization's structure, the CSO works closely with other executives to ensure that security strategies align with business goals, thus influencing decisions on budget allocations for security initiatives. Their expertise in security matters positions them as key decision-makers regarding the investments needed for secure information systems.