$1.$ Apart from Windows and macOS, what operating system options are there for client PCs installed to a local network?

$2.$ You are advising a customer with an older$-$model Android smartphone. The customer wants to update to the latest version of Android, but using the update option results in a $$No updates available$$ message. What type of issue is this, and what advice can you provide?

$3.$ A customer asks whether an iOS app that your company developed will also work on her Apple macOS computer. What issue does this raise, and what answer might you give?

$4.$ You are advising a business that needs to provision video$-$editing workstations with four$-$way multiprocessing. Which retail Windows edition will allow them to make full use of this hardware?

$5.$ You are advising a customer whose business is expanding. The business owner needs to provision an additional $30$ desktop computers, some of which will be installed at a second office location. The business is currently run with a workgroup network of five Windows $7$ Home Premium desktop computers and one file server. Why might you suggest licenses for an edition of Windows $10$ that supports corporate needs for the new computers and has upgrades for the old computers? Which specific edition$($s$)$ could you recommend?