Unlike Windows or macOS users, Linux users enjoy the flexibility of compiling software offered by the operating system. Outline the benefits of this Linux capability as opposed to proprietary operating systems. $[5$ marks$]$

$4\mathrm{.}2$ Sarah, a Computer Science student, faces the challenge of managing an extensive collection of data files for her research project. Aware of the limited storage space on her Linux laptop, she embarks on a quest to compress her files while maintaining accessibility and integrity efficiently. Sarah is exploring various algorithms and techniques available in the Linux ecosystem, which she could use to achieve her objective. Evaluate three options $($of utilities$)$ Sarah could use to achieve her objective, paying attention to conditions that make each option favourable. $[6$ marks$]$

$4\mathrm{.}3$ Mark is setting up a new Linux workstation for his programming projects. Eager to harness the power of open$-$source software, he explores a plethora of repositories, each promising to offer a treasure trove of tools and libraries. However, Mark recalls cautionary tales of compromised repositories and their potential risks to his system's security and stability. As a sysadmin, explore the reasons why Mark must carefully manage and control available repositories.

$[8$ marks$]$