In C++, if a function $f$ is defined as a friend function, then which of the following category of data members can be accessed using the function $f$ ?

In C++, if a function $f$ is defined as a friend function, then which of the following category of data members can be
accessed using the function $f$ ?
1). Only Public
2). Public, Private and Protected
3). Only Protected
4). Only Private

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