How to pass data from child to parent component in angular.

Which of the following examples has four beats in each measure?

Donna and her team of five have invented a new gadget for the science exhibition in their college. which intellectual property right will protect their invention?

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