What do you call the physical, touchable, materials parts of a computer system?

Jason works as an accountant in a department store. he needs to keep a daily record of all the invoices issued by the store. which file naming convention would him the most? a)give the file a unique name b)name the file in yymmdd format c)use descriptive name while naming the files d)use capital letters while naming the file

Idon’t understand the double8 coding problem. it is java

What social factors affect your health