The correct pair is Ubuntu - Operating System. An operating system €“ OS €“ is software that connects the hardware with the software side of the computer. It is designed for computers, smartphones, and network servers. Ubuntu is a free operating system that uses the Linux kernel. The word "ubuntu" is an African word meaning "humanity to others". It also provides various software solutions to corporates as well as other institutes all over the world to help them increase their efficiency and reduce costs. TermsDescriptionAVIAudio Video Interleave (also Audio Video Interleaved), known by its initials AVI and the . avi filename extension, is a multimedia container format introduced by Microsoft in November 1992 as part of its Video for Windows software. AVI files can contain both audio and video data in a file container that allows synchronous audio-with-video playback. AVI files support multiple streaming audio and video. AVI is a video and audio file format used to store audio and/or video information digitally for playback purposes. ExcelMicrosoft Excel is a spreadsheet developed by Microsoft for Windows, macOS, Android, and iOS. It features calculation, graphing tools, pivot tables, and a macro programming language called Visual Basic for Applications. Excel is typically used to organize data and perform financial analysis. It is used across all business functions and at companies from small to large. HDDA hard disk drive (HDD) is a traditional storage device that uses mechanical platters and a moving read/write head to access data. It is an electromechanical device having non-volatile memory. HDDs are also capable of storing operating system, large system files and are found in desktops, mobiles, and consumer electronics. Conclusion:AVI is a video and audio file format and not a file transfer protocol. Microsoft Excel is a spreadsheet used for doing calculations and it's not a word processing software. HDD or hard disk drive is a storage device and does not provide a cloud storage facility. Ubuntu is a free operating system. Hence, option (4) is correct.