Angular dout on following code

Hello everyone,

help me find anwer of this question
Question: find error(s) in code mention in image assume all library has been pre loded

1 errorMessage is declared/used twice
2 Constructor should not be empty
3 Service has not been injected properly into the application
4 There is no error. This code will work just fine.
5 Angular bundles can be created while writing the application as well. The application doesn’t necessarily need to be complete for them to work
6 All the external libraries are also bundled when ng build command is used. We don’t need to include them separately
7 Services are bundled separately from components in Angular prod build
8 None of the above statements are correct
it will very helpfull.