A) Software as a Service (SaaS)
SaaS refers to full applications deployed in the cloud, whereas PaaS and IaaS refer to cloud services that allow for development of new applications with varying levels of hardware abstraction. IaaS usually refers to cloud Virtual Machines, and it allows more control over the types of computers used to run an application (Linux/Windows/RAM/CPUs/etc). PaaS is a set of minimum required components to make an application run, typically not visible to developers. Developers can write code and deploy to a PaaS service without configuring virtual machines or installing dependencies/Operating Systems.
B. It may not be trustworthy,and you risk identity theft
A help system refers to a documentation component that usually accompany every software. It is meant to help the users when they encounter problems in the course of using the software. The most difficult part of working with the help system IS PHRASING YOUR QUESTION. A user has to use the correct words and phrases in order to get the needed help from the help system.
To answer your question the answer would be B compatible browsers
Theory of knowledge (TOK) plays a special role in the International Baccalaureate® (IB) Diploma Programme (DP), by providing an opportunity for students to reflect on the nature of knowledge, and on how we know what we claim to know.