The Most Important Role of an Organization's Data Custodian

C.

The MOST important role of an organization's data custodian in support of information security function is to apply and enforce data security policies and procedures, which includes ensuring that the access to data is appropriate and that sensitive data is protected from unauthorized access or disclosure.

Option B, "Applying approval security policies," is the correct answer, as data custodians are responsible for implementing and enforcing the organization's security policies and procedures to protect sensitive data from unauthorized access or disclosure. The data custodian ensures that data is classified according to its sensitivity and that appropriate controls are implemented to safeguard it.

Option A, "Evaluating data security technology vendors," is not the most important role of a data custodian. While it is important for the data custodian to assess and select appropriate security technology vendors, this is a more specific task that falls within the broader role of implementing security policies and procedures.

Option C, "Approving access rights to departmental data," is also important, but it is not the MOST important role of a data custodian. Access rights management is a critical component of data security, but it is one of several tasks that fall under the broader umbrella of implementing and enforcing security policies and procedures.

Option D, "Assessing data security risks to the organization," is an important task, but it is not the MOST important role of a data custodian. Assessing data security risks is typically the responsibility of the information security team, while the data custodian's primary role is to apply and enforce security policies and procedures.