Please i need help with these questions:

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Question 15 1 pts Which of the following functions will return the length of a C++ string variable called x? O x.length x.size(x) sizeof(x) O strsize(x) Question 16 1 pts Which of the following is true about the scope of a variable declared outside of the main function? O The scope is global to the main function and other functions The scope is limited to within the main function only O The scope may not be accessed within the main function O The scope is limited to functions outside of the main function