Explanation: According to the CISSP CBK Official Study Guide1, an information librarian is responsible for managing, maintaining, and protecting the organization’s knowledge resources, including ensuring that media (such as hard drives, USBs, CDs) are free from corruption or contamination to protect the enterprise’s data integrity. An information librarian is also responsible for cataloging, indexing, and classifying the media, as well as providing access and retrieval services to the authorized users. An information librarian may also perform backup, recovery, and disposal of the media, as well as monitor and audit the usage and security of the media. An information security practitioner is not the operations role that is responsible for protecting the enterprise from corrupt or contaminated media, although they may be involved in defining and enforcing the policies and standards for the media security. An information security practitioner is a general term for a person who performs various functions and tasks related to the information security of the organization, such as planning, designing, implementing, testing, operating, or auditing the information security systems and controls. An information security practitioner may also provide guidance, advice, and training to the other roles and stakeholders on the information security matters. A computer operator is not the operations role that is responsible for protecting the enterprise from corrupt or contaminated media, although they may be involved in using and handling the media. A computer operator is a person who operates and controls the computer systems and devices of the organization, such as the servers, workstations, printers, or scanners. A computer operator may also perform tasks such as loading and unloading the media, running and monitoring the programs and applications, troubleshooting and resolving the errors and problems, and reporting and documenting the activities and incidents. A network administrator is not the operations role that is responsible for protecting the enterprise from corrupt or contaminated media, although they may be involved in configuring and connecting the media. A network administrator is a person who administers and manages the network systems and devices of the organization, such as the routers, switches, firewalls, or wireless access points. A network administrator may also perform tasks such as installing and updating the network software and hardware, setting and maintaining the network parameters and security, optimizing and troubleshooting the network performance and availability, and supporting and assisting the network users and clients. References: 1