6. SCHEMA S, domains are given as follows Days: { sun, mon, tue, Wed, Thur, Fri, Sat } Salary: {100,200,400,500} Dept_name : {HR ', 'Payroll', 'Admin' } a. What is the maximum number of rows possible in a database instance using SCHEMA S? b. How many possible ways can you obtain a relation using SCHEMA S? c. Show an instance of SCHEMA S in a tabular form