Which two valid alternatives to line 3 would decouple this application from a specific implementation of CustomerDAO?

Given the fragment: Which two valid alternatives to line 3 would decouple this application
from a specific implementation of CustomerDAO?

A.
CustomerDAO custDao = CustomerDAO.getInstance();

B.
CustomerDAO custDao = (CustomerDAO) new CustomerDAOmemoryImp1();

C.
CustomerDAO custDao = (CustomerDAO) new Object ();

D.
CustomerDAO custDao = CustomerDAO();

E.
CustomerDAO custDao = customerDAOFactory.getInstance();