The ! operator is an unary operator.

The conditional operator (?:) ________. A: is the only ternary operator in C B: is a unary operator C: associates from left to right D: accepts two operands

For objects of class Rational, overload the unary operator " - ", and the declaration of the operator function is_______ A: void Rational::operator-(); B: friend Rational operator-( ); C: Rational Rational::operator-() D: friend void operator-( Rational a );