Current situation having to do with protection of privacy when using ICT

Which of the following statements best describes it careers?

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

Why do we mark tlc plates with pencil and not with pen