A is wrong because a folder can have any name.
B is wrong because not all folders of a web server are exposed to the outside, only all folders below the document root.
C sounds good
D is wrong because an image can reside somewhere else as long as you specify the absolute or relative path to it
The answer is Software as a Service (SaaS).
SaaS is one of the 3 main categories of cloud computing. In SaaS, a 3rd party provider hosts applications and make them available to customers over the internet. It removes the need for businesses to install and run applications on their own data centers or computers. It also eliminates the expense of hardware acquisition and maintenance, as well as software installation and support.