Read the following passage and solve the questions based on it.
To smoothen the process of issuing of passports, MEA has devised a ‘Single office–Three windows’ system. Under this system, the windows are named W1, W2 and W3. To ease the pressure upon the employees, the windows operate at different time slots on different days.
(i) W1 is open between 10 am and 2 pm on Monday, Wednesday and Thursday and between 2:30 pm and 4:30 pm on Tuesday, Friday and Saturday.
(ii) W2 is open between 9 am and 12 noon on Tuesday, Thursday and Friday and between 1 pm and 3 pm on Monday, Wednesday and Saturday.
(iii) W3 is open between 8 am and 11 am on Monday, Tuesday, Thursday and Friday and between 1 pm and 3 pm on Monday, Wednesday and Saturday.
On which day not more than one window is open simultaneously at any given time?