Question: y and z are user - defined objects and the + = operator is an overloaded member function. The operator is overloaded such that y

y and z are user-defined objects and the += operator is an overloaded member function. The
operator is overloaded such that y += z adds z and y, then stores the result in y. Which of the following
expressions is always equivalent to y += z?
y = y operator+= z
y.operator+=( z )
y = y + z
y operator+=( y + z )

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