Which of the following is true when it comes to SaaS (Software as a service)?

Answer options:

A.You are responsible for scalability of the solution.
B.You are responsible for the maintenance of the underlying hardware.
C.You are responsible for configuring the application settings for client-specific customization.
D.You are responsible for the high availability of the solution.

Answer – C 
Below is a snapshot from the Microsoft documentation on SaaS solutions. 

Here you don’t need to worry about the solution itself, the scalability, or availability. You just managed the configuration. 
Hence all of the other options are incorrect based on the concept of a SaaS solution. 
For more information on SaaS, please visit the below URL- 

https://azure.microsoft.com/en-us/overview/what-is-saas/