Final answer:
Option (C), The subject of this question is Computers and Technology. The appropriate answer is Internet Explorer, which is a web browser that allows users to explore and access the internet.
Step-by-step explanation:
The subject of this question is Computers and Technology. Specifically, the question is referring to adding a person to a client's portal, which suggests it is related to an online platform or system.
The grade level of this question is High School as it is discussing a common technological practice.
An appropriate answer to this question would be option C) Internet Explorer. Internet Explorer is a web browser developed by Microsoft that allows users to explore and access the internet. Adding someone to a portal would require accessing the internet through a web browser like Internet Explorer.