Which of the following methods is used to define a function in JavaScript?

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In JavaScript, defining a function is done using the keyword 'function' followed by the function name and parentheses. The syntax starts with the word 'function', which is crucial because it indicates to the interpreter that you are declaring a new function.

In this case, option A illustrates the correct syntax for a function declaration. After the keyword 'function', you specify the name of the function (myFunction in this example) and enclose any parameters within parentheses. This allows for the creation of a reusable block of code that can be executed when needed.

The other options do not follow JavaScript syntax rules for function definition, which is why they are not correct. Using 'define', 'func', or 'create' in the context of defining a function would lead to errors, as those keywords are not recognized by JavaScript for function declarations. Thus, option A accurately showcases the proper method for defining a function in JavaScript.