When it comes to end$-$user security, the Information Commissioner's Office $($ICO$),$ discusses that it's vital to the reputation and day$-$to$-$day running of businesses that information is kept safe from prying eyes. Cyber$-$attacks affect businesses of all sizes, and complacency along with poor end$-$user security can leave individuals and businesses vulnerable.

a$.$In terms of device security, what approach can we take to help us categorise the components of a desktop computer system?