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Why do classes use mutator methods?

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Why do classes use mutator methods?

(a) Allows client to modify the program

(b) Allows client to modify/write the private members

(c) Allows servers to access all the private data

(d) Allows servers to access only protected members
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Correct option is (b) Allows client to modify/write the private members

The best explanation: The client can have rights to access a file and write something to it. This is mandatory to keep the private data updated. Also it is an advantage over the use of hidden class members.
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