b$.$ Linux users can execute commands either through menu options or by entering commands directly. For which mode would you recommend for the following user categories: company executives, systems administrators, network users, and temporary data entry personnel? Explain your reasoning. $[5$ marks$]$

c$.$ In Linux, devices are identified by a major device number and a minor device number.

i$.$ Explain the main differences between these two types of numbers.

ii$.$ Provide at least three examples of devices for each category. $[5$ marks$]$

d$.$ Investigate the statement: "Open$-$source software is not free software." Determine if this statement is accurate and explain your reasoning. Additionally, discuss common misconceptions about open$-$source software and highlight its advantages. Provide examples and cite your sources.