Final answer:
The activity associated with the operations of a corporate trust administrator is acting as stock registrar option (a), involving maintaining and updating records of a company's stockholders, issuing and canceling stock certificates, and recording ownership changes.
Step-by-step explanation:
The activities typically associated with the operations of a corporate trust administrator include roles such as acting as stock registrar, administering corporate trust services, and ensuring that securities issued by corporations are done properly and managed responsibly.
This role can involve a variety of tasks which may include: serving as a transfer agent, handling corporate actions like dividend payments and mergers, managing escrow accounts, or acting as a fiduciary for corporate bonds and other assets. The options listed largely pertain to retirement plan administration, which is a different set of services usually not directly related to corporate trust administration.
Acting as stock registrar is a function that involves maintaining and updating the records of a company's stockholders. This activity is essential to ensure that ownership of the company's shares is properly documented and can involve issuing and canceling stock certificates, processing transfers, and recording changes in ownership.