This is the best option because it meets the requirements of storing three String variables in a fixed-size data structure. A String[] is an array of String values, which can be initialized with a fixed size and assigned with a set of values using curly braces. An array is a simple and efficient data structure that can store multiple values of the same type and access them by index. A List is another data structure that can store multiple values, but it is not fixed-size and it requires creating a new instance using the New keyword. An Object is a generic type that can store any kind of value, but it is not recommended to use it for specific types like String, as it may cause type conversion errors or performance issues. Therefore, option D is the best choice for storing the three String variables in a fixed-size data structure called UserData. References: Variables, Arguments, and Control Flow in Studio, Data Types in UiPath, Arrays in UiPath