A user$-$defined class in a C$++$ program $\_\_\_\_\_.$A user$-$defined class in a C$++$ program $\_\_\_\_\_.$can have any number of user$-$defined public constructorscan have both a public and private default constructorcan have both a public and private constructor with the same parameter listcannot overload the relational operatorscan have a user defined extraction operatorcan have a user defined insertion operatorcan have any number of user$-$defined private constructors