Suppose the unary ! operator is an overloaded member function of class String. For a String object s, which function call is generated by the compiler when it finds the expression !s?
a. s.operator!()
b. s.operator!( default_value1, default_value2,…)
c. operator!( s )
d. A compiler error results because no arguments are given.
c. operator!( s )
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