Final answer:
To use Software as a Service (SaaS), a client needs an Internet connection, as the services are hosted and accessed online rather than through local servers or physical hardware.
Step-by-step explanation:
To utilize Software as a Service (SaaS), the client primarily needs access to a Internet connection. SaaS is a software distribution model in which applications are hosted by a third-party provider and made available to customers over the internet. Unlike traditional software that is installed locally on the user's hardware, SaaS applications are accessed through a web browser, which requires an internet connection.
Options A) Physical hardware and B) Local servers are not strictly necessary for the client because the service is hosted remotely. D) Printed manuals are also not a requirement for using SaaS, as most providers offer online resources and documentation. Therefore, the correct answer is C) Internet connection.