Card 35 / 42: Based on equals() and hashCode() contract in java, which of the following is true?
A) if o1.equals(o2) is true, then hashCode(o1)== hashCode(o2) must return true
B) if o1.equals(o2) is true, then hashCode(o1)== hashCode(o2) might return true
C) if o1.equals(o2) is false, then hashCode(o1)== hashCode(o2) must return false
D) if o1.equals(o2) is false, then hashCode(o1)== hashCode(o2) might return true
E) if hashCode(o1)== hashCode(o2) returns true then o1.equals(o2) must return true

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