Correct Answer:
A. Gmail
An email service provider is a company that offers email services, allowing users to send and receive electronic messages. Gmail is a prime example of such a service, developed by Google, providing free email accounts.
- Gmail is correct as it is a widely used email service provider.
- "Windows 10" is incorrect because it is an operating system, not an email service.
- "Skype" is incorrect because it is primarily an instant messaging and video calling application, not an email service.
- "Facebook" is incorrect because it is a social media platform, not an email service provider.