A Student class has a property called rollNo and stu is a reference to a Student object and we want the statement stu.RollNo = 28 to fail. Which of the following options will ensure this functionality?

• Declare rollNo property with both get and set accessors.
• Declare rollNo property with only set accessor.
• Declare rollNo property with get, set and normal accessors.
• Declare rollNo property with only get accessor.
• None of the above