Please explain why each alternative is right/wrong :-)

Which statement is correct about equality of objects in Java according to Java's convention? multiple invocation of x.equals(y) consistently return the same value, provided neither object is modified implementation of "equals()" must be reflexive and symmetric but not necessarily transitive "if (a.equals(b))" has the same result as "if (a == b)" equality test with (a == b) might be true if a and b have different types but the same reference