Explanation:

- Option 1: Gmail

- Gmail is a popular web-based email service.

- It was developed by Google and launched on April 1, 2004.

- Option 2: Firefox

- Firefox is not an email service.

- It is a web browser developed by Mozilla.

- Option 3: Opera

- Opera is also not an email service.

- It is a web browser with features like ad blocker and VPN.

- Option 4: Netscape Navigator

- Netscape Navigator is a web browser, not an email service.

- It played a key role in the early growth of the World Wide Web.

- Option 5: Hotmail

- This is the correct answer.

- Hotmail was the first web-based email service and was launched on July 4, 1996.

- It was later acquired by Microsoft and rebranded as Outlook.com.