What is the primary difference between module_function and extend self in Ruby?
A. module_function makes the specified methods accessible as module methods, while extend self makes them accessible as instance methods
B. module_function makes the specified methods private, while extend self makes them public
C. module_function creates a new module, while extend self extends the current module
D. module_function makes the specified methods singleton methods, while extend self makes them instance methods
Answer: Option A
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