In a large multinational organization, the most likely job responsibility to be assigned to the network administrator is A. Managing remote access.
Network administrators specialize in maintaining and securing computer networks. Remote access falls directly under this domain, as it involves ensuring secure and efficient connectivity for employees and authorized individuals to access the organization's network resources from off-site locations.
Developing application programs is usually within the purview of software developers or specific application teams, not network administrators. While network administrators might understand network-related aspects of applications, their primary focus is on the network itself.
Reviewing security policy might involve input from the network administrator as a network security expert, but it's typically led by dedicated security teams or IT leadership who define the overall security guidelines.
Installing operating system upgrades can be part of a network administrator's responsibilities, depending on the organization's structure. However, in large organizations, it might also be handled by a separate system administration team or specialized technicians.
Therefore, while all the options involve IT tasks, managing remote access directly aligns with the core responsibilities of a network administrator in a large multinational organization.