What is the importance of mutable keyword?

1.	What is the importance of mutable keyword?
A.	It will not allow the data member to change within a const member function
B.	It will copy the values of the variable
C.	It allows the data member to change within a const member function
D.	All of above
E.	None of these
Answer» D. All of above

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What is the importance of mutable keyword?
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What is the importance of mutable keyword?

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