Which of the following are the features of service delivery which needs to be enshrined in the Citizen's Charter?

1. 1.Open and transparent about the services offered
2. 2.Clear and measurable standards
3. 3.Details of Grievance Redressal Mechanisms
4. 4.Choice and consultation provisions for citizens
5. 5.Insulation between service provider and citizen

Select the correct option using the code given below: