Which of the following statements about global variables is true?
A. A global variable is accessible only to the main function.
B. A global variable is declared in the highest-level block in which it is used.
C. If a function contains a local variable with the same name as a global variable, the global variable's name takes precedence within the function.
D. A global variable can have the same name as a variable that is declared locally within the function.
E. All of these are true.
Answer: D. A global variable can have the same name as a variable that is declared locally within the function.
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