Employees in your organization access web-based e-mail using cloud-based technologies. What type of technology is this?

Employees in your organization access web-based e-mail using cloud-based technologies. What type of technology is this?

• IaaS
• Network-based DLP
• SaaS
• PaaS 

EXPLANATION

Software as a service (SaaS; pronounced /sæs/) is a software licensing and delivery model in which software is licensed on a subscription basis and is centrally hosted. It is sometimes referred to as "on-demand software", and was formerly referred to as "software plus services" by Microsoft. SaaS is typically accessed by users using a thin client via a web browser. SaaS has become a common delivery model for many business applications, including office and messaging software, payroll processing software, DBMS software, management software, CAD software, development software, gamification, virtualization,[4] accounting, collaboration, customer relationship management (CRM), Management Information Systems (MIS), enterprise resource planning (ERP), invoicing, human resource management(HRM), talent acquisition, content management (CM), and service desk management. SaaS has been incorporated into the strategy of nearly all leading enterprise software companies. 

SOURCE

https://en.wikipedia.org/wiki/Software_as_a_service