How can you make a property optional in Swift?

A) You have to declare a question mark ? in the code to make a property optional

B) You have to declare a question mark & in the code to make a property optional

C) You have to declare a question mark ?? in the code to make a property optional

D) None of the above

Correct Answer : You have to declare a question mark ?? in the code to make a property optional

Explanation : We have to declare a question mark ?? in the code to make a property optional. If a property doesn't have a value, then the symbol ? helps to avoid the runtime error.