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R programming using Rstudio

1. Extract data for all employees with a start _date before 2011.
2. Extract all employees with salary greater than 14000 or less than 9000.
3. Extract employees who are engineers or data scientists with salaries greater than 12000.
4. Add an employee by the name Sam Jones who started work on 2012-07-22 and is an accountant with a salary of 9300 and comes from New Jersey.
5. Delete all data associated with Daniel Hope.