Question: Select correct statement or statements from followings: If a is a global variable, then all the functions can use it If a variable m is

Select correct statement or statements from followings:
If a is a global variable, then all the functions can use it
If a variable m is declared outside of main(), then it can not be used inside of main()
All the functions can make a change to the value of a global variable
All the functions can make a change to the value of a global variable except main()

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