$46.$ If a computer system can be equated to a layered cake, which of the following combinations represents the computer system in the bottom$-$to$-$top order?

a$.$ Hardware, operating system, application, user

b$.$ User, application, hardware, operating system

c$.$ User, operating system, hardware, application

d$.$ Application, operating system, hardware, user

e$.$ Operating system, hardware, user, application