With reference to "Software as a Service (SaaS)", consider the following statements: 1. SaaS buyers can customise the user interface and can change data fields. 2. SaaS users can access their data through their mobile devices. 3. Outlook, Hotmail and Yahoo! Mail are forms of SaaS. Which of the statements given above are correct?

Answer: D. All THREE statements about SaaS are correct. SOFTWARE AS A SERVICE (SaaS) is a cloud-based software delivery model where applications are hosted by a provider and accessed via the internet, typically on a subscription basis. (1) Customisation by buyers: CORRECT. Modern SaaS platforms (Salesforce, ServiceNow, Workday, Microsoft Dynamics 365) provide configuration tools that let buyers CUSTOMISE THE USER INTERFACE, modify data fields, create workflows, and adapt the software to their business needs without altering the core codebase. (2) Mobile access: CORRECT. SaaS applications are designed for cross-device access. Users can access their data via web browsers on PCs, mobile apps (iOS/Android), and tablets. This 'access anywhere' is a key SaaS value proposition. (3) Email services as SaaS: CORRECT. Outlook (Outlook.com / Microsoft 365), Hotmail (now Outlook), Yahoo! Mail, Gmail are textbook examples of SaaS — web-hosted email applications with subscription/free tier model, accessible from any device with internet. All three correctly describe SaaS characteristics. Source: NIST Cloud Computing Definition (SP 800-145) / standard cloud computing references.