Consider the following relation schema for table R: R(ENo,DNo,PNo,EName,DName,PName,Edob,PCity,PCountry,hours,rate) Attributes starting with E refer to Employees, those starting with D refer to Departments, and those with P to Projects. Employees, Departments, and Projects are identi?ed by unique numbers. The number of hours and hourly rate of pay for an employee to carry out a project are determined by himself/herself and the project. There may be multiple projects that are conducted in a department and multiple departments can be involved in a single project as well. Any employee can be a?liated with a few di?erent departments and work in multiple projects at the same time. A project may involve multiple employees. Names for employees, departments and projects are not generally unique. A project will only be conducted in a single city. Multiple cities from the same country may appear in the table, however, cities are uniquely named within and across all countries. Answer the following questions:

(b) Identify the candidate key(s) of R based on the Functional Dependencies. You need to use the concept of attribute closure to identify the key(s). Intermediate steps in this process should be detailed.