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The method to define a function in scripting that is indicated as correct is "function MyFunction { }". This syntax is commonly found in various scripting languages such as JavaScript and shell scripting (like Bash).

In this case, the word "function" is used as a keyword to introduce the function definition, followed by the name of the function (MyFunction), and the curly braces indicate the block of code that comprises the function. This structure is widely recognized among programmers, making it a versatile choice for defining functions in different programming environments.

The other options either use incorrect keywords for function definition or syntax that doesn't align with commonly accepted standards in popular scripting languages. For instance, "define MyFunction { }" lacks recognition in standard programming languages and might create confusion. The use of ":=" in "MyFunction := { }" could be seen in some languages but not as a method to define a function. "func MyFunction { }" resembles the syntax used in languages like Go but is not universally applicable across the most frequently used scripting languages, thus making it incorrect in a broader context.