Which of the following represents a floating-point type in programming?

In programming, a floating-point type is used to represent numbers that have a fractional part, allowing for the representation of real numbers. The choice that represents this type is "double." A double is a data type that can store decimal values with greater precision compared to other types, such as floats. It is commonly used in calculations that require a high degree of accuracy.

On the other hand, the int type is used for representing whole numbers without any fractional component. The char type is primarily used to store single characters, such as letters or symbols. Lastly, string is used for representing sequences of characters, like words or sentences, but does not inherently represent numeric data, especially not in a floating-point format.