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?

Software as a Service (SaaS) is a software distribution model where a cloud provider hosts applications and makes them available to end-users over the internet. Let's examine the statements:

1. SaaS buyers can customise the user interface and can change data fields: While the core software remains with the provider, many SaaS applications offer significant customization options. Users can often tailor the user interface (UI) to their preferences, create custom dashboards, and define or modify data fields to suit their specific business or personal needs within the application's framework. This is a common feature differentiating SaaS from basic web apps.

2. SaaS users can access their data through their mobile devices: This is a key advantage of SaaS. Since the software and data are cloud-hosted, they can be accessed from any device with an internet connection, including mobile phones, tablets, and laptops, making it highly flexible and accessible.

3. Outlook, Hotmail and Yahoo! Mail are forms of SaaS: These web-based email services are quintessential examples of SaaS. Users access the email application and store their data (emails, contacts) on the provider's servers (Microsoft for Outlook/Hotmail, Yahoo for Yahoo! Mail) via a web browser, without needing to install any software locally. The service is provided "as a service" over the internet.

All three statements accurately describe features and examples of SaaS.