Explanation:

The correct option is (d) Instant messaging and the Google toolbar. Freeware is proprietary software that is available for use at no cost, but typically without access to its source code and with restrictions on modification or redistribution. Many instant messaging (IM) client applications (e.g., older versions of Skype, Pidgin, or various web-based IM services) are offered as freeware. The Google Toolbar was also a well-known example of freeware. Option (a) WinZip is commercial/shareware, and Linux is open-source software (which is free but also modifiable, distinguishing it from proprietary freeware). Option (b) Shareware requires eventual payment, and 'file sharing' is a concept, not a software type. Option (c) Microsoft Word is commercial software. Option (e) Microsoft PowerPoint and Microsoft Excel are both commercial software products. Therefore, (d) provides two examples that align with the definition of freeware.