Which of the following are Kotlin data types?

The selection of Int as a Kotlin data type is accurate because Int represents a 32-bit signed integer in Kotlin, which is a fundamental numeric data type used for various computations and variable storage. Kotlin provides several built-in data types, including numeric types like Int, Float, and Double, as well as Boolean and character types.

Float is also a valid Kotlin data type that represents a 32-bit floating-point number. Although it wasn't chosen, it is equally fundamental for handling decimal values. StringBuffer is not a Kotlin data type; instead, Kotlin utilizes String, which is immutable, and also provides StringBuilder for mutable strings. Boolean, while a valid data type representing true or false values, was not selected in this instance. While it is a crucial part of programming logic, the focus on Int in this case emphasizes the importance of integer type in Kotlin’s type system.