【单选题】
It is desirable that a certain method within a certain class can only be accessed by classes that are defined within the same package as the class of the method. How can such restrictions be enforced？（）  
A、Mark the method with the keyword public.
B、Mark the method with the keyword protected.
C、Mark the method with the keyword private.
D、Mark the method with the keyword package.
E、Do not mark the method with any accessibility modifiers.
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