Answer:
Correct option is C: software as a service (SaaS)
Explanation:
In the Software as a service platform, a third-party provider host various applications in the cloud and customers can make use of these applications with an internet connection. Customers can use any device to access these software from any part of the world as long as there is an internet connection. Serves are hosted and maintained by the third-party providers. Phobas Inc. is providing a note application hosted and maintained by them.
