Which of the following allows parameters to be passed to a function?

The choice of input parameters is key to enabling the passing of values to a function. Input parameters act as placeholders that allow you to define the input data a function needs to operate. When a function is called, you can provide specific values for these parameters, which the function then uses within its logic. This feature is crucial for creating dynamic and reusable functions, as it allows the same function to accept different data inputs each time it is invoked.

For instance, if you have a function that calculates the area of a rectangle, you can set up two input parameters: one for the width and another for the height. By passing different values for these parameters each time you call the function, you can calculate the area for rectangles of varying sizes.

In contrast, return values are the output a function gives after executing its code and do not facilitate inputting data into the function. Database queries are related to retrieving or manipulating data stored in a database but do not directly influence how parameters are passed into functions. Data types define the kind of data that can be stored in variables or passed to functions but do not specifically enable the passing of parameters themselves. Thus, input parameters are uniquely designed for that purpose, making them the correct answer.